false--12-31FY20190001578735falsefalsefalse085000000850000000.3750.500.45P6M0.2526576300025255300069874000772000063900084970002362000159600023910002001000794540009552700009590000.010.011500000001500000001129405951133688111129405951133688110.01750.0220007000233070000.500.500.2450.5010000000P5YP1YP1Y1784700002057860001060310002337230001096120002388410006164000030803000005770000110000004500000004500000000.010.0110000000100000002565120256512025651202565120613270005585900045810003521000241000P10YP20YP3YP3YP30Y4039300035689000742500011706800001191250002000002400010000000P3Y3025587037122000P3Y1M24D9.83173280005245000000 0001578735 2019-01-01 2019-12-31 0001578735 us-gaap:SeriesBPreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:CommonStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:SeniorSubordinatedNotesMember 2019-01-01 2019-12-31 0001578735 us-gaap:SeriesAPreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:SeriesCPreferredStockMember 2019-01-01 2019-12-31 0001578735 2019-06-28 0001578735 2020-02-18 0001578735 2018-12-31 0001578735 2019-12-31 0001578735 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 srt:AffiliatedEntityMember 2019-12-31 0001578735 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 srt:AffiliatedEntityMember 2018-12-31 0001578735 2018-01-01 2018-12-31 0001578735 2017-01-01 2017-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0001578735 us-gaap:RetainedEarningsMember 2017-01-01 0001578735 us-gaap:NoncontrollingInterestMember 2018-12-31 0001578735 us-gaap:CommonStockMember 2018-01-01 2018-12-31 0001578735 us-gaap:RetainedEarningsMember 2018-01-01 2018-12-31 0001578735 us-gaap:RetainedEarningsMember 2017-01-01 2017-12-31 0001578735 us-gaap:AdditionalPaidInCapitalMember 2017-01-01 2017-12-31 0001578735 us-gaap:PreferredStockMember 2017-12-31 0001578735 us-gaap:CommonStockMember 2017-01-01 2017-12-31 0001578735 us-gaap:CommonStockMember 2017-12-31 0001578735 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-12-31 0001578735 us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember 2018-01-01 2018-12-31 0001578735 us-gaap:NoncontrollingInterestMember 2017-01-01 2017-12-31 0001578735 us-gaap:RetainedEarningsMember 2016-12-31 0001578735 us-gaap:PreferredStockMember 2016-12-31 0001578735 us-gaap:NoncontrollingInterestMember 2018-01-01 2018-12-31 0001578735 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0001578735 us-gaap:CommonStockMember 2016-12-31 0001578735 us-gaap:SeriesDPreferredStockMember us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-12-31 0001578735 us-gaap:CommonStockMember 2018-12-31 0001578735 2017-01-01 0001578735 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0001578735 us-gaap:RetainedEarningsMember 2018-01-01 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-01-01 2017-12-31 0001578735 us-gaap:NoncontrollingInterestMember 2016-12-31 0001578735 2017-12-31 0001578735 us-gaap:RetainedEarningsMember 2018-12-31 0001578735 us-gaap:NoncontrollingInterestMember 2017-12-31 0001578735 us-gaap:RetainedEarningsMember 2017-12-31 0001578735 2016-12-31 0001578735 us-gaap:PreferredStockMember 2018-12-31 0001578735 us-gaap:SeriesDPreferredStockMember 2018-01-01 2018-12-31 0001578735 2018-01-01 0001578735 us-gaap:AdditionalPaidInCapitalMember 2016-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 0001578735 us-gaap:NoncontrollingInterestMember 2017-01-01 0001578735 us-gaap:CommonStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0001578735 us-gaap:CommonStockMember 2019-12-31 0001578735 us-gaap:RetainedEarningsMember 2019-12-31 0001578735 us-gaap:RetainedEarningsMember 2019-01-01 2019-12-31 0001578735 us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0001578735 us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-12-31 0001578735 us-gaap:NoncontrollingInterestMember 2019-01-01 2019-12-31 0001578735 us-gaap:PreferredStockMember 2019-12-31 0001578735 us-gaap:NoncontrollingInterestMember 2019-12-31 0001578735 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-12-31 0001578735 us-gaap:PreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:PreferredStockMember 2017-01-01 2017-12-31 0001578735 us-gaap:PreferredStockMember 2018-01-01 2018-12-31 0001578735 srt:MaximumMember us-gaap:RestrictedStockUnitsRSUMember 2019-01-01 2019-12-31 0001578735 us-gaap:AccountingStandardsUpdate201602Member us-gaap:DebtMember 2018-12-31 0001578735 srt:MinimumMember us-gaap:RestrictedStockUnitsRSUMember 2019-01-01 2019-12-31 0001578735 us-gaap:BuildingAndBuildingImprovementsMember 2019-01-01 2019-12-31 0001578735 srt:MaximumMember nghc:HardwareSoftwareandOtherEquipmentMember 2019-01-01 2019-12-31 0001578735 srt:MaximumMember us-gaap:OtherMachineryAndEquipmentMember 2019-01-01 2019-12-31 0001578735 srt:MinimumMember nghc:HardwareSoftwareandOtherEquipmentMember 2019-01-01 2019-12-31 0001578735 srt:MinimumMember us-gaap:OtherMachineryAndEquipmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:AccountingStandardsUpdate201602Member 2019-01-01 0001578735 srt:ScenarioForecastMember us-gaap:AccountingStandardsUpdate201613Member 2020-01-01 0001578735 us-gaap:NotesReceivableMember 2018-12-31 0001578735 us-gaap:NotesReceivableMember 2019-12-31 0001578735 nghc:FairValueMember 2018-12-31 0001578735 us-gaap:EquityMethodInvestmentsMember 2019-12-31 0001578735 us-gaap:CostmethodInvestmentsMember 2019-12-31 0001578735 us-gaap:CertificatesOfDepositMember 2018-12-31 0001578735 us-gaap:EquityMethodInvestmentsMember 2018-12-31 0001578735 us-gaap:CertificatesOfDepositMember 2019-12-31 0001578735 nghc:FairValueMember 2019-12-31 0001578735 us-gaap:CostmethodInvestmentsMember 2018-12-31 0001578735 us-gaap:CorporateBondSecuritiesMember 2019-12-31 0001578735 us-gaap:USTreasurySecuritiesMember 2019-12-31 0001578735 us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2019-12-31 0001578735 us-gaap:AssetBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001578735 us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:LSCEntitiesMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:OtherMember 2017-01-01 2017-12-31 0001578735 us-gaap:DebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2019-01-01 2019-12-31 0001578735 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2018-01-01 2018-12-31 0001578735 us-gaap:DebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:EquitySecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2017-01-01 2017-12-31 0001578735 nghc:OtherMember 2019-01-01 2019-12-31 0001578735 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:CashAndShorttermInvestmentsMember 2017-01-01 2017-12-31 0001578735 nghc:CashAndShorttermInvestmentsMember 2019-01-01 2019-12-31 0001578735 nghc:OtherMember 2018-01-01 2018-12-31 0001578735 us-gaap:DebtSecuritiesMember 2017-01-01 2017-12-31 0001578735 nghc:CashAndShorttermInvestmentsMember 2018-01-01 2018-12-31 0001578735 us-gaap:EquitySecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:EquitySecuritiesMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2018-12-31 0001578735 us-gaap:CommonStockMember 2018-12-31 0001578735 us-gaap:CommonStockMember 2019-12-31 0001578735 us-gaap:CorporateBondSecuritiesMember 2018-12-31 0001578735 us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001578735 us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:USTreasurySecuritiesMember 2018-12-31 0001578735 us-gaap:AssetBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2018-12-31 0001578735 us-gaap:USTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:StandardPoorsAAARatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2018-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:DebtSecuritiesAndPreferredSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:DebtSecuritiesAndPreferredSecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:IllinoisCenterBuildingL.P.Member srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:IllinoisCenterBuildingL.P.Member srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:NAAdvisorsGPLLCMember nghc:IllinoisCenterBuildingL.P.Member 2019-12-31 0001578735 nghc:IllinoisCenterBuildingL.P.Member srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:OtherMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:OtherMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:OtherMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:IllinoisCenterBuildingL.P.Member srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:LSCEntitiesMember 2019-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2018-12-31 0001578735 nghc:IllinoisCenterBuildingL.P.Member srt:AffiliatedEntityMember 2018-12-31 0001578735 nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:NorthDearbornBuildingCompanyL.P.Member srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:AmTrustFinancialServicesInc.Member nghc:LSCEntitiesMember 2019-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:NAAdvisorsGPLLCMember nghc:NorthDearbornBuildingCompanyL.P.Member 2019-12-31 0001578735 nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2019-12-31 0001578735 us-gaap:OtherInvestmentsMember 2018-01-01 2018-12-31 0001578735 nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:NorthDearbornBuildingCompanyL.P.Member srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:A4455LBJFreewayLLCMember nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:ACPReLtd.Member nghc:IllinoisCenterBuildingL.P.Member 2019-12-31 0001578735 nghc:NorthDearbornBuildingCompanyL.P.Member srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:NorthDearbornBuildingCompanyL.P.Member srt:AffiliatedEntityMember 2018-12-31 0001578735 nghc:LSCEntitiesinvestmentinLPMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 us-gaap:OtherInvestmentsMember 2017-01-01 2017-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:A4455LBJFreewayLLCMember nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:NorthDearbornBuildingCompanyL.P.Member srt:AffiliatedEntityMember 2019-12-31 0001578735 us-gaap:OtherInvestmentsMember 2019-01-01 2019-12-31 0001578735 nghc:EightHundredSuperiorNMTCinvestmentFundIIMember srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:EightHundredSuperiorLLCMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:EastNinthSuperiorLLCMember srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2018-12-31 0001578735 nghc:A4455LBJFreewayLLCMember nghc:A4455LBJFreewayLLCMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:DebtSecuritiesAndPreferredSecuritiesMember 2019-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:DebtSecuritiesAndPreferredSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:USTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2019-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:StandardPoorsAAARatingMember nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:USTreasurySecuritiesMember 2019-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 srt:StandardPoorsAAARatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:StandardPoorsAAARatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001578735 srt:StandardPoorsAAARatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAPlusandAMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAAAMinusandAAPlusRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBPlusAndLowerRatingMember us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:DebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:DebtSecuritiesMember 2017-01-01 2017-12-31 0001578735 us-gaap:AvailableforsaleSecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:DebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:AvailableforsaleSecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:AvailableforsaleSecuritiesMember 2017-01-01 2017-12-31 0001578735 nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 srt:StandardPoorsAAARatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBPlusAndLowerRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:StandardPoorsAAARatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 srt:StandardPoorsAAARatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAAAMinusandAAPlusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001578735 nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsAAPlusandAMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 srt:StandardPoorsAAARatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsBBPlusAndLowerRatingMember nghc:IndustrialsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:FinancialInstitutionsMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAPlusandAMinusRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:StandardPoorsAAAAMinusandAAPlusRatingMember nghc:UtilitiesAndOtherMember us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:ACPReGroupInc.Member nghc:IllinoisCenterBuildingL.P.Member 2019-12-31 0001578735 us-gaap:EquityMethodInvestmentsMember srt:AffiliatedEntityMember 2018-12-31 0001578735 us-gaap:NotesReceivableMember srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:AmTrustFinancialServicesInc.Member nghc:EightHundredSuperiorNMTCinvestmentFundIIMember 2019-12-31 0001578735 nghc:AmTrustFinancialServicesInc.Member nghc:EastNinthSuperiorLLCMember 2019-12-31 0001578735 us-gaap:NotesReceivableMember srt:AffiliatedEntityMember 2018-12-31 0001578735 nghc:AmTrustFinancialServicesInc.Member nghc:A4455LBJFreewayLLCMember 2019-12-31 0001578735 nghc:AmTrustFinancialServicesInc.Member nghc:EightHundredSuperiorLLCMember 2019-12-31 0001578735 nghc:AmTrustFinancialServicesInc.Member nghc:NorthDearbornBuildingCompanyL.P.Member 2019-12-31 0001578735 us-gaap:EquityMethodInvestmentsMember srt:AffiliatedEntityMember 2019-12-31 0001578735 us-gaap:CorporateBondSecuritiesMember 2018-01-01 2018-12-31 0001578735 us-gaap:CommonStockMember 2018-01-01 2018-12-31 0001578735 us-gaap:CorporateBondSecuritiesMember 2017-12-31 0001578735 us-gaap:PreferredStockMember 2018-01-01 2018-12-31 0001578735 us-gaap:CommonStockMember 2017-12-31 0001578735 us-gaap:OtherInvestmentsMember 2018-01-01 2018-12-31 0001578735 us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-01-01 2018-12-31 0001578735 us-gaap:OtherInvestmentsMember 2017-12-31 0001578735 us-gaap:PreferredStockMember 2017-12-31 0001578735 us-gaap:PreferredStockMember 2018-12-31 0001578735 us-gaap:USStatesAndPoliticalSubdivisionsMember 2017-12-31 0001578735 us-gaap:OtherInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2018-12-31 0001578735 us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-01-01 2019-12-31 0001578735 us-gaap:CorporateBondSecuritiesMember 2019-01-01 2019-12-31 0001578735 us-gaap:CommonStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:OtherInvestmentsMember 2019-01-01 2019-12-31 0001578735 us-gaap:OtherInvestmentsMember 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember us-gaap:FairValueInputsLevel3Member nghc:SurplusNotesMember 2019-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:FairValueInputsLevel3Member us-gaap:SeniorNotesMember 2019-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:FairValueInputsLevel2Member us-gaap:SeniorNotesMember 2018-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:SeniorNotesMember 2019-12-31 0001578735 nghc:CreditAgreementMember us-gaap:LineOfCreditMember 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember us-gaap:FairValueInputsLevel3Member nghc:SurplusNotesMember 2018-12-31 0001578735 nghc:A2019CreditAgreementMember us-gaap:FairValueInputsLevel3Member us-gaap:LineOfCreditMember 2018-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:FairValueInputsLevel2Member us-gaap:SeniorNotesMember 2019-12-31 0001578735 nghc:CreditAgreementMember us-gaap:FairValueInputsLevel3Member us-gaap:LineOfCreditMember 2019-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:SeniorNotesMember 2018-12-31 0001578735 nghc:CreditAgreementMember us-gaap:FairValueInputsLevel3Member us-gaap:LineOfCreditMember 2018-12-31 0001578735 nghc:A2019CreditAgreementMember us-gaap:LineOfCreditMember 2018-12-31 0001578735 nghc:A2019CreditAgreementMember us-gaap:LineOfCreditMember 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember nghc:SurplusNotesMember 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember nghc:SurplusNotesMember 2018-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:SeniorNotesMember 2019-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:FairValueInputsLevel3Member us-gaap:SeniorNotesMember 2018-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:SeniorNotesMember 2018-12-31 0001578735 nghc:A2019CreditAgreementMember us-gaap:FairValueInputsLevel3Member us-gaap:LineOfCreditMember 2019-12-31 0001578735 nghc:CreditAgreementMember us-gaap:LineOfCreditMember 2018-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateBondSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:FairValueMeasurementsRecurringMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherInvestmentsMember 2019-12-31 0001578735 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommonStockMember 2019-12-31 0001578735 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:LeaseholdImprovementsMember 2018-12-31 0001578735 us-gaap:BuildingMember 2019-12-31 0001578735 us-gaap:LeaseholdImprovementsMember 2019-12-31 0001578735 nghc:HardwareSoftwareandOtherEquipmentMember 2019-12-31 0001578735 us-gaap:LandMember 2018-12-31 0001578735 us-gaap:OtherMachineryAndEquipmentMember 2018-12-31 0001578735 nghc:HardwareSoftwareandOtherEquipmentMember 2018-12-31 0001578735 us-gaap:BuildingMember 2018-12-31 0001578735 us-gaap:LandMember 2019-12-31 0001578735 us-gaap:OtherMachineryAndEquipmentMember 2019-12-31 0001578735 nghc:StateLicensesMember 2018-12-31 0001578735 nghc:LossReserveDiscountMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:LossReserveDiscountMember 2018-12-31 0001578735 nghc:LossReserveDiscountMember 2018-12-31 0001578735 nghc:RenewalRightsMember 2018-12-31 0001578735 us-gaap:OtherIntangibleAssetsMember 2018-12-31 0001578735 nghc:AgentRelationshipsMember 2018-12-31 0001578735 us-gaap:ContractBasedIntangibleAssetsMember 2018-12-31 0001578735 us-gaap:TrademarksMember 2018-12-31 0001578735 us-gaap:ContractBasedIntangibleAssetsMember 2019-12-31 0001578735 us-gaap:TrademarksMember 2019-12-31 0001578735 nghc:StateLicensesMember 2019-12-31 0001578735 us-gaap:OtherIntangibleAssetsMember 2019-12-31 0001578735 nghc:RenewalRightsMember 2019-01-01 2019-12-31 0001578735 nghc:AgentRelationshipsMember 2019-12-31 0001578735 us-gaap:OtherIntangibleAssetsMember 2019-01-01 2019-12-31 0001578735 nghc:RenewalRightsMember 2019-12-31 0001578735 nghc:AgentRelationshipsMember 2019-01-01 2019-12-31 0001578735 nghc:FiniteLivedIntangibleAssetsExcludingLossReserveAndPremiumRiskMember 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:FiniteLivedIntangibleAssetsExcludingLossReserveAndPremiumRiskMember 2019-12-31 0001578735 nghc:FiniteLivedIntangibleAssetsExcludingLossReserveAndPremiumRiskMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:OtherIntangibleAssetsMember 2017-01-01 2017-12-31 0001578735 nghc:LossReserveDiscountMember 2018-01-01 2018-12-31 0001578735 nghc:LossReserveDiscountMember 2019-01-01 2019-12-31 0001578735 us-gaap:OtherIntangibleAssetsMember 2018-01-01 2018-12-31 0001578735 nghc:LossReserveDiscountMember 2017-01-01 2017-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2010-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2010-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember 2016-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2013-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2013-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2014-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2012-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2014-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2013-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2015-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2014-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2012-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2014-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2015-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2015-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2015-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2014-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2015-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2013-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2011-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2011-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2010-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2012-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2015-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2016-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2011-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2011-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2010-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyHomeownersandotherMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2010-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoPhysicalDamageMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2010-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2013-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2014-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2011-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2015-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2016-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2012-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-12-31 0001578735 nghc:PropertyandCasualtyAutoLiabilityMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2010-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2010-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortDurationInsuranceContractAccidentYear2019Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2011-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2015-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2014-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2013-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2016-12-31 0001578735 us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2012-12-31 0001578735 nghc:NorthCarolinaReinsuranceFacilityNCRFMember 2019-12-31 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember 2019-12-31 0001578735 nghc:NorthCarolinaReinsuranceFacilityNCRFMember 2019-01-01 2019-12-31 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember 2019-01-01 2019-12-31 0001578735 srt:WeightedAverageMember nghc:HomeownersMember 2019-07-01 2019-07-01 0001578735 nghc:PropertyCatastropheProgramMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-07-01 0001578735 srt:MaximumMember nghc:PersonalAutoMember 2019-01-01 2019-12-31 0001578735 srt:MaximumMember nghc:PersonalAutoMember 2019-07-01 2019-07-01 0001578735 nghc:HomeownersMember 2019-07-01 2019-07-01 0001578735 us-gaap:CededCreditRiskSecuredMember 2019-12-31 0001578735 nghc:HomeownersMember 2019-07-01 2019-12-31 0001578735 srt:MinimumMember nghc:PersonalAutoMember 2019-01-01 2019-12-31 0001578735 nghc:PersonalAutoMember 2019-07-01 2019-07-01 0001578735 nghc:PersonalAutoMember 2019-01-01 2019-12-31 0001578735 nghc:PersonalAutoMember us-gaap:SubsequentEventMember 2020-01-01 2020-01-01 0001578735 nghc:SecondEventMember nghc:PropertyCatastropheProgramMember 2019-05-01 2019-05-01 0001578735 nghc:PropertyCatastropheProgramMember 2019-05-01 2019-05-01 0001578735 nghc:FirstEventMember nghc:PropertyCatastropheProgramMember 2019-05-01 2019-05-01 0001578735 nghc:CasualtyProgramMember 2018-07-01 2018-07-01 0001578735 us-gaap:CededCreditRiskSecuredMember 2018-12-31 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember nghc:AutomobileInsuranceMember 2015-07-01 2017-06-30 0001578735 srt:MinimumMember nghc:PersonalAutoMember 2019-07-01 2019-07-01 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember nghc:MedicalInsuranceMember 2019-01-01 2019-12-31 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember 2018-01-01 2018-12-31 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember 2017-01-01 2017-12-31 0001578735 nghc:OtherReinsurersMember 2019-12-31 0001578735 nghc:HannoverRuckSEMember 2019-12-31 0001578735 nghc:NorthCarolinaReinsuranceFacilityNCRFMember 2018-01-01 2018-12-31 0001578735 nghc:NorthCarolinaReinsuranceFacilityNCRFMember 2017-01-01 2017-12-31 0001578735 nghc:MichiganCatastrophicClaimsAssociationMCCAMember 2018-12-31 0001578735 nghc:NorthCarolinaReinsuranceFacilityNCRFMember 2018-12-31 0001578735 nghc:HannoverRuckSEMember 2018-12-31 0001578735 nghc:OtherReinsurersMember 2018-12-31 0001578735 nghc:SubordinatedDebenturesTrancheIMember nghc:SurplusNotesMember 2019-12-31 0001578735 nghc:A2019CreditAgreementMember 2019-12-31 0001578735 nghc:A2019CreditAgreementMember 2018-12-31 0001578735 nghc:SubordinatedDebenturesTrancheIIMember nghc:SurplusNotesMember 2018-12-31 0001578735 us-gaap:OtherDebtSecuritiesMember 2019-12-31 0001578735 nghc:SubordinatedDebenturesTrancheIMember nghc:SurplusNotesMember 2018-12-31 0001578735 nghc:CreditAgreementMember 2018-12-31 0001578735 us-gaap:OtherDebtSecuritiesMember 2018-12-31 0001578735 nghc:SubordinatedDebenturesTrancheIIMember nghc:SurplusNotesMember 2019-12-31 0001578735 nghc:CreditAgreementMember 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember nghc:SurplusNotesMember 2017-01-01 2017-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:SeniorNotesMember 2019-01-01 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember nghc:SurplusNotesMember 2019-01-01 2019-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:SeniorNotesMember 2018-01-01 2018-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:SeniorNotesMember 2017-01-01 2017-12-31 0001578735 us-gaap:CapitalLeaseObligationsMember 2018-01-01 2018-12-31 0001578735 nghc:CreditAgreementMember nghc:JPMorganChaseN.A.Member 2018-01-01 2018-12-31 0001578735 us-gaap:CapitalLeaseObligationsMember 2017-01-01 2017-12-31 0001578735 nghc:NotesPayableSixPointSevenFivePercentMember us-gaap:SeniorNotesMember 2018-01-01 2018-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:SeniorNotesMember 2017-01-01 2017-12-31 0001578735 nghc:NotesPayableSevenPointSixTwoFivePercentMember us-gaap:SeniorNotesMember 2019-01-01 2019-12-31 0001578735 nghc:CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-01-01 2019-12-31 0001578735 nghc:SubordinatedDebenturesMember nghc:SurplusNotesMember 2018-01-01 2018-12-31 0001578735 us-gaap:OtherDebtSecuritiesMember 2019-01-01 2019-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-01-01 2019-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2018-01-01 2018-12-31 0001578735 nghc:CreditAgreementMember nghc:JPMorganChaseN.A.Member 2017-01-01 2017-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2017-01-01 2017-12-31 0001578735 us-gaap:OtherDebtSecuritiesMember 2017-01-01 2017-12-31 0001578735 us-gaap:OtherDebtSecuritiesMember 2018-01-01 2018-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member nghc:AlternateBaseRateOrLIBORMember 2019-01-01 2019-12-31 0001578735 nghc:CreditAgreementMember nghc:JPMorganChaseN.A.Member 2018-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member us-gaap:LondonInterbankOfferedRateLIBORMember 2019-01-01 2019-12-31 0001578735 nghc:IndentureExcessLeverageRatioMember srt:MaximumMember us-gaap:SeniorNotesMember 2019-12-31 0001578735 srt:MinimumMember nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-01-01 2019-12-31 0001578735 nghc:SubordinatedDebenturesTrancheIIMember nghc:SurplusNotesMember 2019-01-01 2019-12-31 0001578735 nghc:SubordinatedDebenturesTrancheIMember nghc:SurplusNotesMember 2019-01-01 2019-12-31 0001578735 srt:MinimumMember nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-12-31 0001578735 nghc:IndentureExcessLeverageRatioMember srt:MinimumMember us-gaap:SeniorNotesMember 2019-12-31 0001578735 srt:MaximumMember nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-12-31 0001578735 nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-09-30 0001578735 srt:MaximumMember nghc:A2019CreditAgreementMember nghc:JPMorganChaseN.A.Member 2019-01-01 2019-12-31 0001578735 us-gaap:BuildingAndBuildingImprovementsMember 2019-12-31 0001578735 us-gaap:VehiclesMember 2019-12-31 0001578735 srt:MaximumMember 2019-12-31 0001578735 srt:MinimumMember 2019-12-31 0001578735 nghc:ACPReLtd.Member us-gaap:LoansMember srt:AffiliatedEntityMember 2016-07-28 0001578735 nghc:LeaseAgreement30NorthLaSalleMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:ACPReLtd.MaidenInsuranceCompanyandTechnologyInsuranceCompanyMember nghc:ReinsuranceRecoverableonUnpaidLossesMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:ACPReLtd.Member srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:ACPReLtd.MaidenInsuranceCompanyandTechnologyInsuranceCompanyMember nghc:ReinsuranceRecoverableonUnpaidLossesMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:ACPReLtd.Member srt:AffiliatedEntityMember 2016-07-28 2016-07-28 0001578735 nghc:LeaseAgreement30NorthLaSalleMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 us-gaap:LoansMember srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:ACPReLtd.Member srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:ACPReLtd.Member srt:AffiliatedEntityMember 2019-12-31 0001578735 nghc:ACPReLtd.MaidenInsuranceCompanyandTechnologyInsuranceCompanyMember nghc:ReinsuranceRecoverableonUnpaidLossesMember srt:AffiliatedEntityMember 2018-12-31 0001578735 nghc:ACPReLtd.Member srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:ACPReLtd.MaidenInsuranceCompanyandTechnologyInsuranceCompanyMember nghc:ReinsuranceRecoverableonUnpaidLossesMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:ACPReLtd.MaidenInsuranceCompanyandTechnologyInsuranceCompanyMember nghc:ReinsuranceMember srt:AffiliatedEntityMember 2010-03-01 2014-07-31 0001578735 nghc:LeaseAgreement59MaidenLaneMember srt:AffiliatedEntityMember 2017-01-01 2017-12-31 0001578735 nghc:LeaseAgreement59MaidenLaneMember srt:AffiliatedEntityMember 2019-01-01 2019-12-31 0001578735 nghc:LeaseAgreement59MaidenLaneMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:LeaseAgreement30NorthLaSalleMember srt:AffiliatedEntityMember 2018-01-01 2018-12-31 0001578735 nghc:EmploymentAgreementsMember 2019-12-31 0001578735 srt:ScenarioForecastMember us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember us-gaap:SubsequentEventMember 2023-07-16 2023-07-16 0001578735 us-gaap:SeriesAPreferredStockMember us-gaap:PreferredStockMember 2015-12-31 0001578735 us-gaap:SeriesCPreferredStockMember us-gaap:PreferredStockMember 2016-01-01 2016-12-31 0001578735 srt:ScenarioForecastMember us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember us-gaap:SubsequentEventMember 2018-07-11 2023-07-15 0001578735 us-gaap:SeriesBPreferredStockMember us-gaap:PreferredStockMember 2015-12-31 0001578735 us-gaap:SeriesAPreferredStockMember us-gaap:PreferredStockMember 2014-12-31 0001578735 us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember 2018-07-11 0001578735 us-gaap:SeriesCPreferredStockMember us-gaap:PreferredStockMember 2016-12-31 0001578735 srt:ScenarioForecastMember us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember us-gaap:SubsequentEventMember 2023-07-15 0001578735 nghc:AmericanDepositarySharesMember us-gaap:PreferredStockMember 2016-12-31 0001578735 srt:ScenarioForecastMember us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember us-gaap:SubsequentEventMember 2023-07-15 2023-07-15 0001578735 us-gaap:SeriesBPreferredStockMember us-gaap:PreferredStockMember 2015-01-01 2015-12-31 0001578735 us-gaap:SeriesAPreferredStockMember us-gaap:PreferredStockMember 2014-01-01 2014-12-31 0001578735 nghc:AmericanDepositarySharesMember us-gaap:PreferredStockMember 2015-12-31 0001578735 us-gaap:SeriesBPreferredStockMember us-gaap:CommonStockMember 2015-12-31 0001578735 us-gaap:SeriesBPreferredStockMember us-gaap:PreferredStockMember 2019-12-31 0001578735 us-gaap:SeriesDPreferredStockMember us-gaap:PreferredStockMember 2019-12-31 0001578735 us-gaap:SeriesCPreferredStockMember us-gaap:PreferredStockMember 2019-12-31 0001578735 us-gaap:SeriesCPreferredStockMember us-gaap:PreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:SeriesBPreferredStockMember us-gaap:PreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:SeriesAPreferredStockMember us-gaap:PreferredStockMember 2019-12-31 0001578735 us-gaap:SeriesAPreferredStockMember us-gaap:PreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:CommonStockMember 2018-04-01 2018-06-30 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2018-10-01 2018-12-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2018-01-01 2018-03-31 0001578735 us-gaap:SeriesAPreferredStockMember 2018-07-01 2018-09-30 0001578735 us-gaap:SeriesAPreferredStockMember 2018-04-01 2018-06-30 0001578735 us-gaap:SeriesAPreferredStockMember 2018-10-01 2018-12-31 0001578735 us-gaap:CommonStockMember 2018-01-01 2018-03-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2018-04-01 2018-06-30 0001578735 us-gaap:CommonStockMember 2018-10-01 2018-12-31 0001578735 us-gaap:SeriesAPreferredStockMember 2018-01-01 2018-03-31 0001578735 us-gaap:SeriesDPreferredStockMember 2018-10-01 2018-12-31 0001578735 us-gaap:CommonStockMember 2018-07-01 2018-09-30 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2018-07-01 2018-09-30 0001578735 us-gaap:CommonStockMember 2017-01-01 2017-03-31 0001578735 us-gaap:SeriesAPreferredStockMember 2017-07-01 2017-09-30 0001578735 us-gaap:CommonStockMember 2017-04-01 2017-06-30 0001578735 us-gaap:SeriesAPreferredStockMember 2017-01-01 2017-03-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2017-10-01 2017-12-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2017-04-01 2017-06-30 0001578735 us-gaap:SeriesAPreferredStockMember 2017-10-01 2017-12-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2017-01-01 2017-03-31 0001578735 us-gaap:CommonStockMember 2017-10-01 2017-12-31 0001578735 us-gaap:CommonStockMember 2017-07-01 2017-09-30 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2017-07-01 2017-09-30 0001578735 us-gaap:SeriesAPreferredStockMember 2017-04-01 2017-06-30 0001578735 us-gaap:SeriesAPreferredStockMember 2019-01-01 2019-03-31 0001578735 us-gaap:CommonStockMember 2019-07-01 2019-09-30 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2019-04-01 2019-06-30 0001578735 us-gaap:SeriesAPreferredStockMember 2019-10-01 2019-12-31 0001578735 us-gaap:CommonStockMember 2019-01-01 2019-03-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2019-01-01 2019-03-31 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2019-10-01 2019-12-31 0001578735 us-gaap:SeriesAPreferredStockMember 2019-04-01 2019-06-30 0001578735 us-gaap:SeriesDPreferredStockMember 2019-10-01 2019-12-31 0001578735 us-gaap:SeriesDPreferredStockMember 2019-04-01 2019-06-30 0001578735 nghc:PreferredStockSeriesBAndSeriesCMember 2019-07-01 2019-09-30 0001578735 us-gaap:SeriesAPreferredStockMember 2019-07-01 2019-09-30 0001578735 us-gaap:CommonStockMember 2019-04-01 2019-06-30 0001578735 us-gaap:CommonStockMember 2019-10-01 2019-12-31 0001578735 nghc:LifeInsuranceDomesticEntitiesMember 2017-01-01 2017-12-31 0001578735 nghc:PropertyandCasualtyDomesticEntitiesMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyForeignEntitiesMember 2017-01-01 2017-12-31 0001578735 nghc:PropertyandCasualtyDomesticEntitiesMember 2019-01-01 2019-12-31 0001578735 nghc:PropertyandCasualtyForeignEntitiesMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyMember 2017-01-01 2017-12-31 0001578735 nghc:LifeInsuranceDomesticEntitiesMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyForeignEntitiesMember 2019-01-01 2019-12-31 0001578735 nghc:PropertyandCasualtyMember 2019-01-01 2019-12-31 0001578735 nghc:PropertyandCasualtyDomesticEntitiesMember 2017-01-01 2017-12-31 0001578735 nghc:LifeInsuranceDomesticEntitiesMember 2019-01-01 2019-12-31 0001578735 nghc:PropertyandCasualtyForeignEntitiesMember 2019-12-31 0001578735 nghc:PropertyandCasualtyDomesticEntitiesMember 2019-12-31 0001578735 nghc:LifeInsuranceDomesticEntitiesMember 2019-12-31 0001578735 nghc:PropertyandCasualtyForeignEntitiesMember 2018-12-31 0001578735 nghc:PropertyandCasualtyMember 2018-12-31 0001578735 nghc:PropertyandCasualtyMember 2019-12-31 0001578735 nghc:LifeInsuranceDomesticEntitiesMember 2018-12-31 0001578735 nghc:PropertyandCasualtyDomesticEntitiesMember 2018-12-31 0001578735 us-gaap:EmployeeStockOptionMember 2019-01-01 2019-12-31 0001578735 us-gaap:RestrictedStockUnitsRSUMember 2019-01-01 2019-12-31 0001578735 us-gaap:RestrictedStockUnitsRSUMember 2018-01-01 2018-12-31 0001578735 us-gaap:RestrictedStockUnitsRSUMember 2017-01-01 2017-12-31 0001578735 us-gaap:CommonStockMember 2019-12-31 0001578735 us-gaap:EmployeeStockOptionMember 2018-01-01 2018-12-31 0001578735 us-gaap:EmployeeStockOptionMember 2017-01-01 2017-12-31 0001578735 us-gaap:RestrictedStockUnitsRSUMember 2018-12-31 0001578735 us-gaap:RestrictedStockUnitsRSUMember 2019-12-31 0001578735 us-gaap:EmployeeStockOptionMember 2018-12-31 0001578735 us-gaap:EmployeeStockOptionMember 2019-12-31 0001578735 us-gaap:NonredeemablePreferredStockMember 2019-01-01 2019-12-31 0001578735 us-gaap:NonredeemablePreferredStockMember 2017-01-01 2017-12-31 0001578735 us-gaap:NonredeemableConvertiblePreferredStockMember 2017-01-01 2017-12-31 0001578735 us-gaap:NonredeemableConvertiblePreferredStockMember 2018-01-01 2018-12-31 0001578735 us-gaap:NonredeemablePreferredStockMember 2018-01-01 2018-12-31 0001578735 us-gaap:NonredeemableConvertiblePreferredStockMember 2019-01-01 2019-12-31 0001578735 nghc:LatepaymentfeesMember 2017-01-01 2017-12-31 0001578735 nghc:InstallmentfeesMember 2018-01-01 2018-12-31 0001578735 nghc:FinanceandProcessingFeesMember 2019-01-01 2019-12-31 0001578735 nghc:FinanceandProcessingFeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:InstallmentfeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:LatepaymentfeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:CommissionrevenueMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:LatepaymentfeesMember 2018-01-01 2018-12-31 0001578735 nghc:InstallmentfeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:LatepaymentfeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:CommissionrevenueMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:OtherserviceandfeeincomeMember 2019-01-01 2019-12-31 0001578735 nghc:OtherserviceandfeeincomeMember 2017-01-01 2017-12-31 0001578735 nghc:CommissionrevenueMember 2017-01-01 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:InstallmentfeesMember 2019-01-01 2019-12-31 0001578735 nghc:InstallmentfeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:OtherserviceandfeeincomeMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:OtherserviceandfeeincomeMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:FinanceandProcessingFeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:FinanceandProcessingFeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:CommissionrevenueMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:LatepaymentfeesMember 2019-01-01 2019-12-31 0001578735 nghc:InstallmentfeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:GrouphealthadministrativefeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:AccidentAndHealthInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:GrouphealthadministrativefeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:OtherserviceandfeeincomeMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:GrouphealthadministrativefeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:LatepaymentfeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:GrouphealthadministrativefeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:GrouphealthadministrativefeesMember 2018-01-01 2018-12-31 0001578735 nghc:FinanceandProcessingFeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:OtherserviceandfeeincomeMember 2018-01-01 2018-12-31 0001578735 nghc:CommissionrevenueMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:InstallmentfeesMember 2017-01-01 2017-12-31 0001578735 nghc:InstallmentfeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:CommissionrevenueMember 2018-01-01 2018-12-31 0001578735 nghc:GrouphealthadministrativefeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:OtherserviceandfeeincomeMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:GrouphealthadministrativefeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:FinanceandProcessingFeesMember 2017-01-01 2017-12-31 0001578735 nghc:GrouphealthadministrativefeesMember 2019-01-01 2019-12-31 0001578735 nghc:InstallmentfeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:OtherserviceandfeeincomeMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:LatepaymentfeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:OtherserviceandfeeincomeMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:FinanceandProcessingFeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:CommissionrevenueMember 2019-01-01 2019-12-31 0001578735 nghc:LatepaymentfeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:LatepaymentfeesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:FinanceandProcessingFeesMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:FinanceandProcessingFeesMember 2018-01-01 2018-12-31 0001578735 nghc:CommissionrevenueMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:GrouphealthadministrativefeesMember 2017-01-01 2017-12-31 0001578735 nghc:CommissionrevenueMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:HomeownersMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:LenderplacedinsuranceMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:CommercialAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:PropertyandCasualtyOtherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:HomeownersMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:HomeownersMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:GroupPoliciesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:InternationalMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:PropertyandCasualtyOtherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:HomeownersMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:PersonalAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:PropertyandCasualtyOtherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:CommercialAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyOtherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:PersonalAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:HomeownersMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:PersonalAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:IndividualPoliciesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:HomeownersMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:LenderplacedinsuranceMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:InternationalMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:GroupPoliciesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:RVPackagedMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:PersonalAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:LenderplacedinsuranceMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:PropertyandCasualtyOtherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:RVPackagedMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:InternationalMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:CommercialAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:IndividualPoliciesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:PropertyandCasualtyOtherMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:IndividualPoliciesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember us-gaap:GroupPoliciesMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 nghc:PersonalAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:PersonalAutoMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:RVPackagedMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:NorthAmericaMember 2017-01-01 2017-12-31 0001578735 srt:NorthAmericaMember 2018-01-01 2018-12-31 0001578735 srt:EuropeMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:NorthAmericaMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:EuropeMember 2017-01-01 2017-12-31 0001578735 srt:EuropeMember 2018-01-01 2018-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:NorthAmericaMember 2019-01-01 2019-12-31 0001578735 srt:EuropeMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 srt:NorthAmericaMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 srt:NorthAmericaMember 2017-01-01 2017-12-31 0001578735 srt:EuropeMember 2017-01-01 2017-12-31 0001578735 srt:NorthAmericaMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001578735 srt:NorthAmericaMember 2019-01-01 2019-12-31 0001578735 srt:NorthAmericaMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:EuropeMember 2018-01-01 2018-12-31 0001578735 srt:EuropeMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001578735 srt:EuropeMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember srt:EuropeMember 2019-01-01 2019-12-31 0001578735 us-gaap:CorporateNonSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-12-31 0001578735 us-gaap:CorporateNonSegmentMember 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-12-31 0001578735 us-gaap:CorporateNonSegmentMember 2018-12-31 0001578735 us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 us-gaap:CorporateNonSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:ThirdPartyFeeMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2017-01-01 2017-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:ThirdPartyFeeMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2019-01-01 2019-12-31 0001578735 nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember nghc:ThirdPartyFeeMember us-gaap:AccidentAndHealthInsuranceSegmentMember 2018-01-01 2018-12-31 0001578735 2019-07-01 2019-09-30 0001578735 2019-04-01 2019-06-30 0001578735 2019-01-01 2019-03-31 0001578735 2019-10-01 2019-12-31 0001578735 2018-07-01 2018-09-30 0001578735 2018-04-01 2018-06-30 0001578735 2018-01-01 2018-03-31 0001578735 2018-10-01 2018-12-31 0001578735 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember nghc:EuroAccidentHealthAndCareInsuranceSwedenMember 2019-12-02 2019-12-02 0001578735 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember nghc:EuroAccidentHealthAndCareInsuranceSwedenMember 2019-12-02 0001578735 nghc:InvestmentsExcludingEquityInvestmentsInUnconsolidatedSubsidiariesMember 2019-12-31 0001578735 us-gaap:EquitySecuritiesInvestmentSummaryMember 2019-12-31 0001578735 us-gaap:DebtSecuritiesMember 2019-12-31 0001578735 us-gaap:PublicUtilityBondsMember 2019-12-31 0001578735 us-gaap:IndustrialMiscellaneousAndAllOthersMember 2019-12-31 0001578735 us-gaap:ShortTermInvestmentsMember 2019-12-31 0001578735 us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001578735 us-gaap:USTreasuryAndGovernmentMember 2019-12-31 0001578735 us-gaap:AllOtherCorporateBondsMember 2019-12-31 0001578735 us-gaap:OtherInvestmentsMember 2019-12-31 0001578735 us-gaap:ForeignGovernmentDebtMember 2019-12-31 0001578735 srt:ParentCompanyMember 2019-12-31 0001578735 srt:ParentCompanyMember 2018-12-31 0001578735 srt:ParentCompanyMember 2019-01-01 2019-12-31 0001578735 srt:ParentCompanyMember 2017-01-01 2017-12-31 0001578735 srt:ParentCompanyMember 2018-01-01 2018-12-31 0001578735 srt:ParentCompanyMember 2017-12-31 0001578735 srt:ParentCompanyMember 2016-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:PropertyandCasualtyMember 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:PropertyandCasualtyMember 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:AccidentandHealthMember 2018-01-01 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:AccidentandHealthMember 2018-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:AccidentandHealthMember 2019-01-01 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:PropertyandCasualtyMember 2017-01-01 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:AccidentandHealthMember 2017-01-01 2017-12-31 0001578735 us-gaap:CorporateNonSegmentMember 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:AccidentandHealthMember 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:PropertyandCasualtyMember 2019-01-01 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:PropertyandCasualtyMember 2019-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:AccidentandHealthMember 2017-12-31 0001578735 us-gaap:OperatingSegmentsMember nghc:PropertyandCasualtyMember 2018-01-01 2018-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2019-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2017-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2017-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2018-01-01 2018-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2019-01-01 2019-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2018-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2017-01-01 2017-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2018-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2017-01-01 2017-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2016-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2019-01-01 2019-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2018-01-01 2018-12-31 0001578735 us-gaap:ValuationAllowanceOfDeferredTaxAssetsMember 2019-12-31 0001578735 us-gaap:AllowanceForCreditLossMember 2016-12-31 iso4217:USD nghc:state iso4217:USD xbrli:shares xbrli:shares nghc:contract nghc:security xbrli:pure nghc:claim nghc:segment

false2020FY0001578735P6MP3YP3Y00015787352020-01-012020-12-310001578735us-gaap:CommonStockMember2020-01-012020-12-310001578735us-gaap:SeriesAPreferredStockMember2020-01-012020-12-310001578735us-gaap:SeriesBPreferredStockMember2020-01-012020-12-310001578735us-gaap:SeriesCPreferredStockMember2020-01-012020-12-310001578735us-gaap:SeniorSubordinatedNotesMember2020-01-012020-12-31iso4217:USD00015787352020-06-30xbrli:shares00015787352020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2019-12-3100015787352019-12-310001578735srt:AffiliatedEntityMember2020-12-310001578735srt:AffiliatedEntityMember2019-12-31iso4217:USDxbrli:shares00015787352019-01-012019-12-3100015787352018-01-012018-12-310001578735us-gaap:PreferredStockMember2017-12-310001578735us-gaap:CommonStockMember2017-12-310001578735us-gaap:AdditionalPaidInCapitalMember2017-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310001578735us-gaap:RetainedEarningsMember2017-12-310001578735us-gaap:NoncontrollingInterestMember2017-12-3100015787352017-12-310001578735us-gaap:RetainedEarningsMember2018-01-012018-12-310001578735us-gaap:NoncontrollingInterestMember2018-01-012018-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001578735us-gaap:CommonStockMember2018-01-012018-12-310001578735us-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001578735us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2018-01-012018-12-310001578735us-gaap:SeriesDPreferredStockMemberus-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001578735us-gaap:SeriesDPreferredStockMember2018-01-012018-12-310001578735us-gaap:PreferredStockMember2018-12-310001578735us-gaap:CommonStockMember2018-12-310001578735us-gaap:AdditionalPaidInCapitalMember2018-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001578735us-gaap:RetainedEarningsMember2018-12-310001578735us-gaap:NoncontrollingInterestMember2018-12-3100015787352018-12-310001578735us-gaap:RetainedEarningsMember2019-01-012019-12-310001578735us-gaap:NoncontrollingInterestMember2019-01-012019-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001578735us-gaap:CommonStockMember2019-01-012019-12-310001578735us-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310001578735us-gaap:PreferredStockMember2019-12-310001578735us-gaap:CommonStockMember2019-12-310001578735us-gaap:AdditionalPaidInCapitalMember2019-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001578735us-gaap:RetainedEarningsMember2019-12-310001578735us-gaap:NoncontrollingInterestMember2019-12-310001578735us-gaap:TreasuryStockMember2019-12-310001578735us-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2020-01-010001578735us-gaap:NoncontrollingInterestMemberus-gaap:AccountingStandardsUpdate201613Member2020-01-010001578735us-gaap:AccountingStandardsUpdate201613Member2020-01-010001578735us-gaap:RetainedEarningsMember2020-01-012020-12-310001578735us-gaap:NoncontrollingInterestMember2020-01-012020-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001578735us-gaap:TreasuryStockMember2020-01-012020-12-310001578735us-gaap:CommonStockMember2020-01-012020-12-310001578735us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310001578735us-gaap:PreferredStockMember2020-12-310001578735us-gaap:CommonStockMember2020-12-310001578735us-gaap:TreasuryStockMember2020-12-310001578735us-gaap:AdditionalPaidInCapitalMember2020-12-310001578735us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310001578735us-gaap:RetainedEarningsMember2020-12-310001578735us-gaap:NoncontrollingInterestMember2020-12-310001578735us-gaap:PreferredStockMember2020-01-012020-12-310001578735us-gaap:PreferredStockMember2019-01-012019-12-310001578735us-gaap:PreferredStockMember2018-01-012018-12-31nghc:state0001578735us-gaap:RestrictedStockUnitsRSUMembersrt:MinimumMember2020-01-012020-12-310001578735us-gaap:RestrictedStockUnitsRSUMembersrt:MaximumMember2020-01-012020-12-310001578735us-gaap:BuildingAndBuildingImprovementsMember2020-01-012020-12-310001578735srt:MinimumMemberus-gaap:OtherMachineryAndEquipmentMember2020-01-012020-12-310001578735srt:MaximumMemberus-gaap:OtherMachineryAndEquipmentMember2020-01-012020-12-310001578735srt:MinimumMembernghc:HardwareSoftwareandOtherEquipmentMember2020-01-012020-12-310001578735nghc:HardwareSoftwareandOtherEquipmentMembersrt:MaximumMember2020-01-012020-12-310001578735nghc:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001578735us-gaap:USTreasurySecuritiesMember2020-12-310001578735us-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001578735us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001578735us-gaap:CorporateBondSecuritiesMember2020-12-310001578735us-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:AssetBackedSecuritiesMember2020-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2020-12-310001578735us-gaap:USTreasurySecuritiesMember2019-12-310001578735us-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001578735us-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001578735us-gaap:CorporateBondSecuritiesMember2019-12-310001578735us-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:AssetBackedSecuritiesMember2019-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2019-12-31nghc:securityxbrli:pure0001578735nghc:CashAndShorttermInvestmentsMember2020-01-012020-12-310001578735nghc:CashAndShorttermInvestmentsMember2019-01-012019-12-310001578735nghc:CashAndShorttermInvestmentsMember2018-01-012018-12-310001578735us-gaap:DebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:DebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:DebtSecuritiesMember2018-01-012018-12-310001578735srt:AffiliatedEntityMembernghc:OtherMember2020-01-012020-12-310001578735srt:AffiliatedEntityMembernghc:OtherMember2019-01-012019-12-310001578735srt:AffiliatedEntityMembernghc:OtherMember2018-01-012018-12-310001578735nghc:OtherMember2020-01-012020-12-310001578735nghc:OtherMember2019-01-012019-12-310001578735nghc:OtherMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2018-01-012018-12-310001578735us-gaap:DebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:DebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:DebtSecuritiesMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:USTreasurySecuritiesMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:USTreasurySecuritiesMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembersrt:StandardPoorsAAARatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember2020-12-310001578735srt:StandardPoorsAAARatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-12-310001578735nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-12-310001578735nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-12-310001578735nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:StandardPoorsBBPlusAndLowerRatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember2020-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:DebtSecuritiesMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:DebtSecuritiesMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:USTreasurySecuritiesMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:USTreasurySecuritiesMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembersrt:StandardPoorsAAARatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember2019-12-310001578735srt:StandardPoorsAAARatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-12-310001578735nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-12-310001578735nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-12-310001578735nghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:StandardPoorsBBPlusAndLowerRatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMember2019-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMembernghc:DebtSecuritiesExcludingUSTreasurySecuritiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:DebtSecuritiesMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:DebtSecuritiesMember2019-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-01-012020-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMember2020-01-012020-12-310001578735nghc:FinancialInstitutionsMemberus-gaap:CorporateDebtSecuritiesMember2020-12-310001578735nghc:FinancialInstitutionsMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMembernghc:IndustrialsMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-01-012020-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2020-01-012020-12-310001578735nghc:UtilitiesAndOtherMembersrt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-01-012020-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-01-012020-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-01-012020-12-310001578735nghc:UtilitiesAndOtherMembernghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMember2020-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-01-012020-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:CorporateDebtSecuritiesMember2020-12-310001578735us-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembersrt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2020-01-012020-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-01-012019-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:FinancialInstitutionsMember2019-01-012019-12-310001578735nghc:FinancialInstitutionsMemberus-gaap:CorporateDebtSecuritiesMember2019-12-310001578735nghc:FinancialInstitutionsMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMembernghc:IndustrialsMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-01-012019-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:IndustrialsMember2019-01-012019-12-310001578735nghc:UtilitiesAndOtherMembersrt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-01-012019-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-01-012019-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-01-012019-12-310001578735nghc:UtilitiesAndOtherMembernghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMember2019-12-310001578735nghc:UtilitiesAndOtherMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-01-012019-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:CorporateDebtSecuritiesMember2019-12-310001578735us-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembersrt:StandardPoorsAAARatingMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735srt:StandardPoorsAAARatingMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAAAMinusandAAPlusRatingMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsAAPlusandAMinusRatingMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMembernghc:StandardPoorsBBBBBBPlusBBBMinusRatingMember2019-01-012019-12-310001578735nghc:StandardPoorsBBPlusAndLowerRatingMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:EquityMethodInvestmentsMembersrt:AffiliatedEntityMember2020-12-310001578735us-gaap:EquityMethodInvestmentsMembersrt:AffiliatedEntityMember2019-12-310001578735us-gaap:EquityMethodInvestmentsMember2020-12-310001578735us-gaap:EquityMethodInvestmentsMember2019-12-310001578735us-gaap:NotesReceivableMember2020-12-310001578735us-gaap:NotesReceivableMember2019-12-310001578735srt:AffiliatedEntityMemberus-gaap:NotesReceivableMember2020-12-310001578735srt:AffiliatedEntityMemberus-gaap:NotesReceivableMember2019-12-310001578735us-gaap:CertificatesOfDepositMember2020-12-310001578735us-gaap:CertificatesOfDepositMember2019-12-310001578735nghc:FairValueMember2020-12-310001578735nghc:FairValueMember2019-12-310001578735us-gaap:CostmethodInvestmentsMember2020-12-310001578735us-gaap:CostmethodInvestmentsMember2019-12-310001578735nghc:LSCEntityMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMember2020-12-310001578735nghc:LSCEntityMembernghc:AmTrustFinancialServicesInc.Member2020-12-310001578735nghc:LSCEntitiesinvestmentinLPMember2020-12-31nghc:contract0001578735nghc:LSCEntityMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMember2019-12-310001578735nghc:LSCEntityMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMember2018-12-310001578735nghc:LSCEntityMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMember2020-01-012020-12-310001578735nghc:LSCEntityMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMember2019-01-012019-12-310001578735nghc:LSCEntityMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:EightHundredSuperiorLLCMembernghc:AmTrustFinancialServicesInc.Member2020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:EightHundredSuperiorLLCMember2020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:EightHundredSuperiorLLCMember2019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:EightHundredSuperiorLLCMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:EightHundredSuperiorLLCMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:EightHundredSuperiorLLCMember2018-01-012018-12-310001578735nghc:EightHundredSuperiorLLCMembersrt:AffiliatedEntityMember2020-01-012020-12-310001578735nghc:EightHundredSuperiorLLCMembersrt:AffiliatedEntityMember2019-01-012019-12-310001578735nghc:EightHundredSuperiorLLCMembersrt:AffiliatedEntityMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:NorthDearbornBuildingCompanyL.P.Membernghc:AmTrustFinancialServicesInc.Member2020-12-310001578735nghc:NAAdvisorsGPLLCMembernghc:NorthDearbornBuildingCompanyL.P.Member2020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:NorthDearbornBuildingCompanyL.P.Member2020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:NorthDearbornBuildingCompanyL.P.Member2019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:NorthDearbornBuildingCompanyL.P.Member2020-01-012020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:NorthDearbornBuildingCompanyL.P.Member2019-01-012019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:NorthDearbornBuildingCompanyL.P.Member2018-01-012018-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMembernghc:AmTrustFinancialServicesInc.Member2020-12-310001578735srt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMember2020-12-310001578735srt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMember2019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMember2018-01-012018-12-310001578735srt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMembernghc:A4455LBJFreewayLLCMember2020-01-012020-12-310001578735srt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMembernghc:A4455LBJFreewayLLCMember2019-01-012019-12-310001578735srt:AffiliatedEntityMembernghc:A4455LBJFreewayLLCMembernghc:A4455LBJFreewayLLCMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:IllinoisCenterBuildingL.P.Membernghc:AmTrustFinancialServicesInc.Member2020-12-310001578735nghc:IllinoisCenterBuildingL.P.Membernghc:ACPReLtd.Member2020-12-310001578735nghc:NAAdvisorsGPLLCMembernghc:IllinoisCenterBuildingL.P.Member2020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:IllinoisCenterBuildingL.P.Member2020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:IllinoisCenterBuildingL.P.Member2019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:IllinoisCenterBuildingL.P.Member2020-01-012020-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:IllinoisCenterBuildingL.P.Member2019-01-012019-12-310001578735us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMembersrt:AffiliatedEntityMembernghc:IllinoisCenterBuildingL.P.Member2018-01-012018-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001578735us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:ShortTermInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Membernghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001578735us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:ShortTermInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Membernghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:FairValueInputsLevel1Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001578735us-gaap:OtherInvestmentsMember2019-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMember2020-01-012020-12-310001578735us-gaap:CorporateBondSecuritiesMember2020-01-012020-12-310001578735us-gaap:OtherInvestmentsMember2020-01-012020-12-310001578735us-gaap:OtherInvestmentsMember2020-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMember2018-12-310001578735us-gaap:CorporateBondSecuritiesMember2018-12-310001578735us-gaap:OtherInvestmentsMember2018-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMember2019-01-012019-12-310001578735us-gaap:CorporateBondSecuritiesMember2019-01-012019-12-310001578735us-gaap:OtherInvestmentsMember2019-01-012019-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSevenPointSixTwoFivePercentMember2020-12-310001578735us-gaap:SeniorNotesMemberus-gaap:FairValueInputsLevel2Membernghc:NotesPayableSevenPointSixTwoFivePercentMember2020-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSevenPointSixTwoFivePercentMember2019-12-310001578735us-gaap:SeniorNotesMemberus-gaap:FairValueInputsLevel2Membernghc:NotesPayableSevenPointSixTwoFivePercentMember2019-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSixPointSevenFivePercentMember2020-12-310001578735us-gaap:SeniorNotesMemberus-gaap:FairValueInputsLevel3Membernghc:NotesPayableSixPointSevenFivePercentMember2020-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSixPointSevenFivePercentMember2019-12-310001578735us-gaap:SeniorNotesMemberus-gaap:FairValueInputsLevel3Membernghc:NotesPayableSixPointSevenFivePercentMember2019-12-310001578735nghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2020-12-310001578735us-gaap:FairValueInputsLevel3Membernghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2020-12-310001578735nghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2019-12-310001578735us-gaap:FairValueInputsLevel3Membernghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2019-12-310001578735us-gaap:LineOfCreditMembernghc:A2019CreditAgreementMember2020-12-310001578735us-gaap:LineOfCreditMemberus-gaap:FairValueInputsLevel3Membernghc:A2019CreditAgreementMember2020-12-310001578735us-gaap:LineOfCreditMembernghc:A2019CreditAgreementMember2019-12-310001578735us-gaap:LineOfCreditMemberus-gaap:FairValueInputsLevel3Membernghc:A2019CreditAgreementMember2019-12-310001578735nghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:AccidentAndHealthSegmentMember2019-12-310001578735nghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:AccidentAndHealthSegmentMember2018-12-310001578735nghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:AccidentAndHealthSegmentMember2017-12-310001578735nghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735nghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:AccidentAndHealthSegmentMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2018-12-310001578735us-gaap:LandMember2020-12-310001578735us-gaap:LandMember2019-12-310001578735us-gaap:BuildingMember2020-12-310001578735us-gaap:BuildingMember2019-12-310001578735us-gaap:LeaseholdImprovementsMember2020-12-310001578735us-gaap:LeaseholdImprovementsMember2019-12-310001578735us-gaap:OtherMachineryAndEquipmentMember2020-12-310001578735us-gaap:OtherMachineryAndEquipmentMember2019-12-310001578735nghc:HardwareSoftwareandOtherEquipmentMember2020-12-310001578735nghc:HardwareSoftwareandOtherEquipmentMember2019-12-310001578735nghc:AgentRelationshipsMember2020-12-310001578735nghc:AgentRelationshipsMember2020-01-012020-12-310001578735nghc:RenewalRightsMember2020-12-310001578735nghc:RenewalRightsMember2020-01-012020-12-310001578735us-gaap:OtherIntangibleAssetsMember2020-12-310001578735us-gaap:OtherIntangibleAssetsMember2020-01-012020-12-310001578735us-gaap:ContractBasedIntangibleAssetsMember2020-12-310001578735nghc:StateLicensesMember2020-12-310001578735us-gaap:TrademarksMember2020-12-310001578735nghc:AgentRelationshipsMember2019-12-310001578735nghc:RenewalRightsMember2019-12-310001578735us-gaap:OtherIntangibleAssetsMember2019-12-310001578735us-gaap:ContractBasedIntangibleAssetsMember2019-12-310001578735nghc:StateLicensesMember2019-12-310001578735us-gaap:TrademarksMember2019-12-310001578735us-gaap:OtherIntangibleAssetsMember2019-01-012019-12-310001578735us-gaap:OtherIntangibleAssetsMember2018-01-012018-12-310001578735nghc:LossReserveDiscountMember2020-01-012020-12-310001578735nghc:LossReserveDiscountMember2019-01-012019-12-310001578735nghc:LossReserveDiscountMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:FiniteLivedIntangibleAssetsExcludingLossReserveAndPremiumRiskMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:FiniteLivedIntangibleAssetsExcludingLossReserveAndPremiumRiskMember2020-12-310001578735nghc:FiniteLivedIntangibleAssetsExcludingLossReserveAndPremiumRiskMember2020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2017-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2011-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2012-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2020-12-31nghc:claim0001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2011-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2011-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2012-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2011-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2012-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2013-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2014-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2015-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2016-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2012-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2013-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2014-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2015-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2016-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2013-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2014-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2015-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2016-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:AccidentAndHealthSegmentMember2015-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:AccidentAndHealthSegmentMember2016-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:AccidentAndHealthSegmentMember2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:AccidentAndHealthSegmentMember2016-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:AccidentAndHealthSegmentMember2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:AccidentAndHealthSegmentMember2018-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:AccidentAndHealthInsuranceSegmentMembernghc:AccidentAndHealthSegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2011-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2012-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membernghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMembernghc:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:PropertyandCasualtyAutoLiabilityMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2011-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyAutoPhysicalDamageMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2011-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2012-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2013-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2014-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2015-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2016-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2018-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyHomeownersandotherMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:MichiganCatastrophicClaimsAssociationMCCAMember2020-12-310001578735nghc:NorthCarolinaReinsuranceFacilityNCRFMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Membernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-01-012020-12-310001578735nghc:ShortDurationInsuranceContractAccidentYear2020Member2020-01-012020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Membernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-01-012020-12-310001578735us-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-01-012020-12-310001578735nghc:PersonalAutoMember2019-01-012019-01-010001578735nghc:PersonalAutoMember2019-07-012019-07-010001578735nghc:PersonalAutoMembersrt:MaximumMember2019-07-012019-07-010001578735srt:MinimumMembernghc:PersonalAutoMember2019-07-012019-07-010001578735nghc:PersonalAutoMember2020-01-012020-01-010001578735nghc:HomeownersMember2019-07-012019-07-010001578735nghc:HomeownersMember2020-07-012020-07-010001578735nghc:PropertyCatastropheProgramMember2020-05-012020-05-01nghc:reinstatement0001578735nghc:PropertyCatastropheProgramMember2020-05-010001578735nghc:FirstEventMembernghc:PropertyCatastropheProgramMember2020-05-012020-05-010001578735nghc:SecondEventMembernghc:PropertyCatastropheProgramMember2020-05-012020-05-010001578735nghc:FirstEventNamedWindMembernghc:PropertyCatastropheProgramMember2020-05-012020-05-010001578735nghc:CasualtyProgramMember2020-10-012020-10-010001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PersonalLinesMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PersonalLinesHomeownersMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PersonalLinesMember2020-07-012020-07-010001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PersonalLinesHomeownersMember2020-07-012020-07-010001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PersonalLinesAutoMember2020-07-012020-07-010001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyCatastropheProgramMember2020-07-012020-07-010001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyCatastropheProgramMember2020-07-010001578735nghc:TopLayerCoverageMember2020-07-172020-07-170001578735nghc:MedicalInsuranceMembernghc:MichiganCatastrophicClaimsAssociationMCCAMember2020-01-012020-12-310001578735nghc:MichiganCatastrophicClaimsAssociationMCCAMember2020-01-012020-12-310001578735nghc:MichiganCatastrophicClaimsAssociationMCCAMember2019-12-310001578735nghc:MichiganCatastrophicClaimsAssociationMCCAMember2019-01-012019-12-310001578735nghc:MichiganCatastrophicClaimsAssociationMCCAMember2018-01-012018-12-310001578735nghc:NorthCarolinaReinsuranceFacilityNCRFMember2020-01-012020-12-310001578735nghc:NorthCarolinaReinsuranceFacilityNCRFMember2019-12-310001578735nghc:NorthCarolinaReinsuranceFacilityNCRFMember2019-01-012019-12-310001578735nghc:NorthCarolinaReinsuranceFacilityNCRFMember2018-01-012018-12-310001578735nghc:HannoverRuckSEMember2020-12-310001578735nghc:OtherReinsurersMember2020-12-310001578735nghc:HannoverRuckSEMember2019-12-310001578735nghc:OtherReinsurersMember2019-12-310001578735us-gaap:CededCreditRiskSecuredMember2020-12-310001578735us-gaap:CededCreditRiskSecuredMember2019-12-310001578735us-gaap:LondonInterbankOfferedRateLIBORMembernghc:SurplusNotesMembernghc:SubordinatedDebenturesTrancheIMember2020-01-012020-12-310001578735nghc:SurplusNotesMembernghc:SubordinatedDebenturesTrancheIMember2020-12-310001578735nghc:SurplusNotesMembernghc:SubordinatedDebenturesTrancheIMember2019-12-310001578735us-gaap:LondonInterbankOfferedRateLIBORMembernghc:SurplusNotesMembernghc:SubordinatedDebenturesTrancheIIMember2020-01-012020-12-310001578735nghc:SurplusNotesMembernghc:SubordinatedDebenturesTrancheIIMember2020-12-310001578735nghc:SurplusNotesMembernghc:SubordinatedDebenturesTrancheIIMember2019-12-310001578735nghc:A2019CreditAgreementMemberus-gaap:LondonInterbankOfferedRateLIBORMembernghc:JPMorganChaseN.A.Member2019-01-012019-12-310001578735nghc:A2019CreditAgreementMemberus-gaap:LondonInterbankOfferedRateLIBORMembernghc:JPMorganChaseN.A.Member2020-01-012020-12-310001578735nghc:A2019CreditAgreementMember2020-12-310001578735nghc:A2019CreditAgreementMember2019-12-310001578735us-gaap:OtherDebtSecuritiesMember2020-12-310001578735us-gaap:OtherDebtSecuritiesMember2019-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Member2020-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Member2019-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSixPointSevenFivePercentMember2020-01-012020-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSixPointSevenFivePercentMember2019-01-012019-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSixPointSevenFivePercentMember2018-01-012018-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSevenPointSixTwoFivePercentMember2020-01-012020-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSevenPointSixTwoFivePercentMember2019-01-012019-12-310001578735us-gaap:SeniorNotesMembernghc:NotesPayableSevenPointSixTwoFivePercentMember2018-01-012018-12-310001578735nghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2020-01-012020-12-310001578735nghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2019-01-012019-12-310001578735nghc:SubordinatedDebenturesMembernghc:SurplusNotesMember2018-01-012018-12-310001578735nghc:JPMorganChaseN.A.Membernghc:CreditAgreementMember2020-01-012020-12-310001578735nghc:JPMorganChaseN.A.Membernghc:CreditAgreementMember2019-01-012019-12-310001578735nghc:JPMorganChaseN.A.Membernghc:CreditAgreementMember2018-01-012018-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Member2020-01-012020-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Member2019-01-012019-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Member2018-01-012018-12-310001578735us-gaap:OtherDebtSecuritiesMember2020-01-012020-12-310001578735us-gaap:OtherDebtSecuritiesMember2019-01-012019-12-310001578735us-gaap:OtherDebtSecuritiesMember2018-01-012018-12-310001578735nghc:A2019CreditAgreementMembersrt:MinimumMembernghc:JPMorganChaseN.A.Member2019-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Membersrt:MaximumMember2019-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Memberus-gaap:FederalFundsEffectiveSwapRateMember2019-01-012019-12-310001578735nghc:A2019CreditAgreementMembersrt:MinimumMembernghc:JPMorganChaseN.A.Member2019-01-012019-12-310001578735nghc:A2019CreditAgreementMembernghc:JPMorganChaseN.A.Membersrt:MaximumMember2019-01-012019-12-310001578735nghc:OtherMemberus-gaap:OtherDebtSecuritiesMember2020-12-310001578735srt:MinimumMemberus-gaap:SeniorNotesMembernghc:IndentureExcessLeverageRatioMember2020-12-310001578735us-gaap:SeniorNotesMembernghc:IndentureExcessLeverageRatioMembersrt:MaximumMember2020-12-310001578735nghc:EmploymentAgreementsMember2020-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2014-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2014-01-012014-12-310001578735us-gaap:PreferredStockMembernghc:AmericanDepositarySharesMember2015-12-310001578735us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2015-01-012015-12-310001578735us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2015-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2015-12-310001578735us-gaap:CommonStockMemberus-gaap:SeriesBPreferredStockMember2015-12-310001578735us-gaap:PreferredStockMembernghc:AmericanDepositarySharesMember2016-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2016-01-012016-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2016-12-310001578735us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2018-12-310001578735srt:ScenarioForecastMemberus-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2018-01-012023-07-140001578735srt:ScenarioForecastMemberus-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2023-07-152023-07-150001578735srt:ScenarioForecastMemberus-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2023-07-150001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2020-01-012020-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2019-01-012019-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2020-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesAPreferredStockMember2019-12-310001578735us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2019-01-012019-12-310001578735us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2020-01-012020-12-310001578735us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2019-12-310001578735us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2020-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2020-01-012020-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2019-01-012019-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2019-12-310001578735us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2020-12-310001578735us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2020-12-310001578735us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2019-12-310001578735us-gaap:CommonStockMember2020-10-012020-12-310001578735us-gaap:CommonStockMember2020-07-012020-09-300001578735us-gaap:CommonStockMember2020-04-012020-06-300001578735us-gaap:CommonStockMember2020-01-012020-03-310001578735us-gaap:SeriesAPreferredStockMember2020-10-012020-12-310001578735us-gaap:SeriesAPreferredStockMember2020-07-012020-09-300001578735us-gaap:SeriesAPreferredStockMember2020-04-012020-06-300001578735us-gaap:SeriesAPreferredStockMember2020-01-012020-03-310001578735nghc:PreferredStockSeriesBAndSeriesCMember2020-10-012020-12-310001578735nghc:PreferredStockSeriesBAndSeriesCMember2020-07-012020-09-300001578735nghc:PreferredStockSeriesBAndSeriesCMember2020-04-012020-06-300001578735nghc:PreferredStockSeriesBAndSeriesCMember2020-01-012020-03-310001578735us-gaap:SeriesDPreferredStockMember2020-10-012020-12-310001578735us-gaap:SeriesDPreferredStockMember2020-04-012020-06-300001578735us-gaap:CommonStockMember2019-10-012019-12-310001578735us-gaap:CommonStockMember2019-07-012019-09-300001578735us-gaap:CommonStockMember2019-04-012019-06-300001578735us-gaap:CommonStockMember2019-01-012019-03-310001578735us-gaap:SeriesAPreferredStockMember2019-10-012019-12-310001578735us-gaap:SeriesAPreferredStockMember2019-07-012019-09-300001578735us-gaap:SeriesAPreferredStockMember2019-04-012019-06-300001578735us-gaap:SeriesAPreferredStockMember2019-01-012019-03-310001578735nghc:PreferredStockSeriesBAndSeriesCMember2019-10-012019-12-310001578735nghc:PreferredStockSeriesBAndSeriesCMember2019-07-012019-09-300001578735nghc:PreferredStockSeriesBAndSeriesCMember2019-04-012019-06-300001578735nghc:PreferredStockSeriesBAndSeriesCMember2019-01-012019-03-310001578735us-gaap:SeriesDPreferredStockMember2019-10-012019-12-310001578735us-gaap:SeriesDPreferredStockMember2019-04-012019-06-300001578735us-gaap:CommonStockMember2018-10-012018-12-310001578735us-gaap:CommonStockMember2018-07-012018-09-300001578735us-gaap:CommonStockMember2018-04-012018-06-300001578735us-gaap:CommonStockMember2018-01-012018-03-310001578735us-gaap:SeriesAPreferredStockMember2018-10-012018-12-310001578735us-gaap:SeriesAPreferredStockMember2018-07-012018-09-300001578735us-gaap:SeriesAPreferredStockMember2018-04-012018-06-300001578735us-gaap:SeriesAPreferredStockMember2018-01-012018-03-310001578735nghc:PreferredStockSeriesBAndSeriesCMember2018-10-012018-12-310001578735nghc:PreferredStockSeriesBAndSeriesCMember2018-07-012018-09-300001578735nghc:PreferredStockSeriesBAndSeriesCMember2018-04-012018-06-300001578735nghc:PreferredStockSeriesBAndSeriesCMember2018-01-012018-03-310001578735us-gaap:SeriesDPreferredStockMember2018-10-012018-12-3100015787352020-04-292020-04-2900015787352020-04-290001578735us-gaap:CommonStockMember2019-01-012019-12-310001578735us-gaap:CommonStockMember2019-12-310001578735us-gaap:CommonStockMember2020-12-310001578735us-gaap:EmployeeStockOptionMember2019-12-310001578735us-gaap:EmployeeStockOptionMember2020-01-012020-12-310001578735us-gaap:EmployeeStockOptionMember2020-12-310001578735us-gaap:EmployeeStockOptionMember2019-01-012019-12-310001578735us-gaap:EmployeeStockOptionMember2018-01-012018-12-310001578735us-gaap:RestrictedStockUnitsRSUMember2019-12-310001578735us-gaap:RestrictedStockUnitsRSUMember2020-01-012020-12-310001578735us-gaap:RestrictedStockUnitsRSUMember2020-12-310001578735us-gaap:RestrictedStockUnitsRSUMember2019-01-012019-12-310001578735us-gaap:RestrictedStockUnitsRSUMember2018-01-012018-12-310001578735srt:AffiliatedEntityMembernghc:ACPReLtd.Member2020-12-310001578735us-gaap:LoansMembersrt:AffiliatedEntityMember2020-12-310001578735srt:AffiliatedEntityMembernghc:ACPReLtd.Member2020-01-012020-12-310001578735us-gaap:LoansMembersrt:AffiliatedEntityMembernghc:ACPReLtd.Member2020-12-310001578735srt:ScenarioForecastMemberus-gaap:LoansMembersrt:AffiliatedEntityMembernghc:ACPReLtd.Member2026-09-202026-09-200001578735us-gaap:LoansMembersrt:AffiliatedEntityMembernghc:ACPReLtd.Member2020-01-012020-12-310001578735us-gaap:LoansMembersrt:AffiliatedEntityMembernghc:ACPReLtd.Member2019-01-012019-12-310001578735us-gaap:LoansMembersrt:AffiliatedEntityMembernghc:ACPReLtd.Member2018-01-012018-12-310001578735nghc:LeaseAgreement59MaidenLaneMembersrt:AffiliatedEntityMember2020-01-012020-12-310001578735nghc:LeaseAgreement59MaidenLaneMembersrt:AffiliatedEntityMember2019-01-012019-12-310001578735nghc:LeaseAgreement59MaidenLaneMembersrt:AffiliatedEntityMember2018-01-012018-12-310001578735nghc:LeaseAgreement30NorthLaSalleMembersrt:AffiliatedEntityMember2020-01-012020-12-310001578735nghc:LeaseAgreement30NorthLaSalleMembersrt:AffiliatedEntityMember2019-01-012019-12-310001578735nghc:LeaseAgreement30NorthLaSalleMembersrt:AffiliatedEntityMember2018-01-012018-12-310001578735nghc:PropertyandCasualtyDomesticEntitiesMember2020-12-310001578735nghc:PropertyandCasualtyDomesticEntitiesMember2019-12-310001578735nghc:PropertyandCasualtyForeignEntitiesMember2020-12-310001578735nghc:PropertyandCasualtyForeignEntitiesMember2019-12-310001578735nghc:PropertyandCasualtyMember2020-12-310001578735nghc:PropertyandCasualtyMember2019-12-310001578735nghc:LifeInsuranceDomesticEntitiesMember2020-12-310001578735nghc:LifeInsuranceDomesticEntitiesMember2019-12-310001578735nghc:PropertyandCasualtyDomesticEntitiesMember2020-01-012020-12-310001578735nghc:PropertyandCasualtyDomesticEntitiesMember2019-01-012019-12-310001578735nghc:PropertyandCasualtyDomesticEntitiesMember2018-01-012018-12-310001578735nghc:PropertyandCasualtyForeignEntitiesMember2020-01-012020-12-310001578735nghc:PropertyandCasualtyForeignEntitiesMember2019-01-012019-12-310001578735nghc:PropertyandCasualtyForeignEntitiesMember2018-01-012018-12-310001578735nghc:PropertyandCasualtyMember2020-01-012020-12-310001578735nghc:PropertyandCasualtyMember2019-01-012019-12-310001578735nghc:PropertyandCasualtyMember2018-01-012018-12-310001578735nghc:LifeInsuranceDomesticEntitiesMember2020-01-012020-12-310001578735nghc:LifeInsuranceDomesticEntitiesMember2019-01-012019-12-310001578735nghc:LifeInsuranceDomesticEntitiesMember2018-01-012018-12-310001578735us-gaap:NonredeemablePreferredStockMember2020-01-012020-12-310001578735us-gaap:NonredeemablePreferredStockMember2019-01-012019-12-310001578735us-gaap:NonredeemablePreferredStockMember2018-01-012018-12-310001578735us-gaap:NonredeemableConvertiblePreferredStockMember2020-01-012020-12-310001578735us-gaap:NonredeemableConvertiblePreferredStockMember2019-01-012019-12-310001578735us-gaap:NonredeemableConvertiblePreferredStockMember2018-01-012018-12-31nghc:segment0001578735us-gaap:OperatingSegmentsMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735us-gaap:CorporateNonSegmentMember2020-01-012020-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735us-gaap:CorporateNonSegmentMember2019-01-012019-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735us-gaap:CorporateNonSegmentMember2018-01-012018-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyAndCasualtySegmentMember2020-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentAndHealthSegmentMember2020-12-310001578735us-gaap:CorporateNonSegmentMember2020-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyAndCasualtySegmentMember2019-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentAndHealthSegmentMember2019-12-310001578735us-gaap:CorporateNonSegmentMember2019-12-310001578735nghc:CommissionrevenueMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:CommissionrevenueMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:CommissionrevenueMember2020-01-012020-12-310001578735nghc:CommissionrevenueMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:CommissionrevenueMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:CommissionrevenueMember2019-01-012019-12-310001578735nghc:CommissionrevenueMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:CommissionrevenueMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735nghc:CommissionrevenueMember2018-01-012018-12-310001578735nghc:FinanceandProcessingFeesMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:FinanceandProcessingFeesMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:FinanceandProcessingFeesMember2020-01-012020-12-310001578735nghc:FinanceandProcessingFeesMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:FinanceandProcessingFeesMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:FinanceandProcessingFeesMember2019-01-012019-12-310001578735nghc:FinanceandProcessingFeesMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:FinanceandProcessingFeesMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735nghc:FinanceandProcessingFeesMember2018-01-012018-12-310001578735nghc:PropertyAndCasualtySegmentMembernghc:GrouphealthadministrativefeesMember2020-01-012020-12-310001578735nghc:AccidentAndHealthSegmentMembernghc:GrouphealthadministrativefeesMember2020-01-012020-12-310001578735nghc:GrouphealthadministrativefeesMember2020-01-012020-12-310001578735nghc:PropertyAndCasualtySegmentMembernghc:GrouphealthadministrativefeesMember2019-01-012019-12-310001578735nghc:AccidentAndHealthSegmentMembernghc:GrouphealthadministrativefeesMember2019-01-012019-12-310001578735nghc:GrouphealthadministrativefeesMember2019-01-012019-12-310001578735nghc:PropertyAndCasualtySegmentMembernghc:GrouphealthadministrativefeesMember2018-01-012018-12-310001578735nghc:AccidentAndHealthSegmentMembernghc:GrouphealthadministrativefeesMember2018-01-012018-12-310001578735nghc:GrouphealthadministrativefeesMember2018-01-012018-12-310001578735nghc:InstallmentfeesMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:InstallmentfeesMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:InstallmentfeesMember2020-01-012020-12-310001578735nghc:InstallmentfeesMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:InstallmentfeesMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:InstallmentfeesMember2019-01-012019-12-310001578735nghc:InstallmentfeesMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:InstallmentfeesMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735nghc:InstallmentfeesMember2018-01-012018-12-310001578735nghc:LatepaymentfeesMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:LatepaymentfeesMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:LatepaymentfeesMember2020-01-012020-12-310001578735nghc:LatepaymentfeesMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:LatepaymentfeesMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:LatepaymentfeesMember2019-01-012019-12-310001578735nghc:LatepaymentfeesMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:LatepaymentfeesMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735nghc:LatepaymentfeesMember2018-01-012018-12-310001578735nghc:PropertyAndCasualtySegmentMembernghc:OtherserviceandfeeincomeMember2020-01-012020-12-310001578735nghc:AccidentAndHealthSegmentMembernghc:OtherserviceandfeeincomeMember2020-01-012020-12-310001578735nghc:OtherserviceandfeeincomeMember2020-01-012020-12-310001578735nghc:PropertyAndCasualtySegmentMembernghc:OtherserviceandfeeincomeMember2019-01-012019-12-310001578735nghc:AccidentAndHealthSegmentMembernghc:OtherserviceandfeeincomeMember2019-01-012019-12-310001578735nghc:OtherserviceandfeeincomeMember2019-01-012019-12-310001578735nghc:PropertyAndCasualtySegmentMembernghc:OtherserviceandfeeincomeMember2018-01-012018-12-310001578735nghc:AccidentAndHealthSegmentMembernghc:OtherserviceandfeeincomeMember2018-01-012018-12-310001578735nghc:OtherserviceandfeeincomeMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:PersonalAutoMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:PersonalAutoMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:PersonalAutoMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:HomeownersMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:HomeownersMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:HomeownersMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:RVPackagedMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:RVPackagedMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:RVPackagedMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:CommercialAutoMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:CommercialAutoMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyAndCasualtySegmentMembernghc:CommercialAutoMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:LenderplacedinsuranceMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:LenderplacedinsuranceMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:LenderplacedinsuranceMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyandCasualtyOtherMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyandCasualtyOtherMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:PropertyandCasualtyOtherMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMemberus-gaap:GroupPoliciesMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMemberus-gaap:GroupPoliciesMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMemberus-gaap:GroupPoliciesMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMemberus-gaap:IndividualPoliciesMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMemberus-gaap:IndividualPoliciesMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:AccidentAndHealthSegmentMemberus-gaap:IndividualPoliciesMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:InternationalMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:InternationalMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:InternationalMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMembernghc:PersonalAutoMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMembernghc:PersonalAutoMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMembernghc:PersonalAutoMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMembernghc:HomeownersMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMembernghc:HomeownersMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyAndCasualtySegmentMembernghc:HomeownersMember2018-01-012018-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyOtherMembernghc:PropertyAndCasualtySegmentMember2020-01-012020-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyOtherMembernghc:PropertyAndCasualtySegmentMember2019-01-012019-12-310001578735us-gaap:VariableInterestEntityPrimaryBeneficiaryMembernghc:PropertyandCasualtyOtherMembernghc:PropertyAndCasualtySegmentMember2018-01-012018-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:ThirdPartyFeeMembernghc:AccidentAndHealthSegmentMember2020-01-012020-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:ThirdPartyFeeMembernghc:AccidentAndHealthSegmentMember2019-01-012019-12-310001578735nghc:NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMembernghc:ThirdPartyFeeMembernghc:AccidentAndHealthSegmentMember2018-01-012018-12-3100015787352020-01-012020-03-3100015787352020-04-012020-06-3000015787352020-07-012020-09-3000015787352020-10-012020-12-3100015787352019-01-012019-03-3100015787352019-04-012019-06-3000015787352019-07-012019-09-3000015787352019-10-012019-12-310001578735us-gaap:SubsequentEventMembernghc:NationalGeneralHoldingsCorpMembernghc:TheAllstateCorporationMember2021-01-040001578735us-gaap:SubsequentEventMembernghc:NationalGeneralHoldingsCorpMembernghc:TheAllstateCorporationMember2021-01-042021-01-040001578735us-gaap:SubsequentEventMember2021-01-042021-01-040001578735us-gaap:USTreasuryAndGovernmentMember2020-12-310001578735us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001578735us-gaap:ForeignGovernmentDebtMember2020-12-310001578735us-gaap:PublicUtilityBondsMember2020-12-310001578735us-gaap:AllOtherCorporateBondsMember2020-12-310001578735us-gaap:DebtSecuritiesMember2020-12-310001578735us-gaap:IndustrialMiscellaneousAndAllOthersMember2020-12-310001578735us-gaap:EquitySecuritiesInvestmentSummaryMember2020-12-310001578735us-gaap:OtherInvestmentsMember2020-12-310001578735us-gaap:ShortTermInvestmentsMember2020-12-310001578735nghc:InvestmentsExcludingEquityInvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001578735srt:ParentCompanyMember2020-12-310001578735srt:ParentCompanyMember2019-12-310001578735srt:ParentCompanyMember2020-01-012020-12-310001578735srt:ParentCompanyMember2019-01-012019-12-310001578735srt:ParentCompanyMember2018-01-012018-12-310001578735srt:ParentCompanyMember2018-12-310001578735srt:ParentCompanyMember2017-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyandCasualtyMember2020-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyandCasualtyMember2020-01-012020-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentandHealthMember2020-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentandHealthMember2020-01-012020-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyandCasualtyMember2019-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyandCasualtyMember2019-01-012019-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentandHealthMember2019-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentandHealthMember2019-01-012019-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyandCasualtyMember2018-12-310001578735us-gaap:OperatingSegmentsMembernghc:PropertyandCasualtyMember2018-01-012018-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentandHealthMember2018-12-310001578735us-gaap:OperatingSegmentsMembernghc:AccidentandHealthMember2018-01-012018-12-310001578735us-gaap:CorporateNonSegmentMember2018-12-31

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K


☒			ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, ~~2019~~2020


☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period from to

Commission File Number: 001-36311

NATIONAL GENERAL HOLDINGS CORP.

(Exact Name of Registrant as Specified in Its Charter)


Delaware						27-1046208
(State or Other Jurisdiction of Incorporation or Organization)						(I.R.S. Employer Identification No.)

59 Maiden Lane, 38th Floor

New York, New York 10038

(Address of Principal Executive Offices) (Zip Code)

(212) 380-9500

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

~~Trading Symbol(s)~~

~~Name of Each Exchange on Which Registered~~

Trading Symbol(s)

Name of Each Exchange on Which Registered

Common Stock, par value $0.01 per share

~~NGHC~~

Filing Compare · National General Holdings Corp.