Label	Element	Value
Stock Issued For Initial Public Offering, Value	amr_StockIssuedForInitialPublicOfferingValue	$ 400,000,000
Noncontrolling Interest, Period Increase (Decrease)	us-gaap_MinorityInterestPeriodIncreaseDecrease	2,058,635,000
Noncontrolling Interest, Increase (Decrease) From Redemptions	amr_NoncontrollingInterestIncreaseDecreaseFromRedemptions	(33,000)
Parent [Member]
Stock Issued For Initial Public Offering, Value	amr_StockIssuedForInitialPublicOfferingValue	400,000,000
Reclassifications of Temporary to Permanent Equity	us-gaap_ReclassificationsOfTemporaryToPermanentEquity	996,384,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1,391,346,000
Noncontrolling Interest, Increase (Decrease) From Redemptions	amr_NoncontrollingInterestIncreaseDecreaseFromRedemptions	(33,000)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2,058,635,000
Noncontrolling Interest, Period Increase (Decrease)	us-gaap_MinorityInterestPeriodIncreaseDecrease	2,058,635,000
Additional Paid-in Capital [Member]
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	(21,000)
Stock Issued For Initial Public Offering, Value	amr_StockIssuedForInitialPublicOfferingValue	399,996,000
Reclassifications of Temporary to Permanent Equity	us-gaap_ReclassificationsOfTemporaryToPermanentEquity	996,374,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1,399,422,000
Noncontrolling Interest, Increase (Decrease) From Redemptions	amr_NoncontrollingInterestIncreaseDecreaseFromRedemptions	(33,000)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ (8,114,000)
Common Class B [Member] \| Common Stock [Member]
Stock Issued During Period, Shares, Conversion of Convertible Securities	us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	25,875,000
Stock Issued During Period, Value, Conversion of Convertible Securities	us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	$ (3,000)
Common Class C [Member] \| Common Stock [Member]
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	21,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 21,000
Stock Issued During Period, Shares, New Issues	us-gaap_StockIssuedDuringPeriodSharesNewIssues	213,402,000
Shares, Outstanding	us-gaap_SharesOutstanding	213,402,000
Common Class A [Member] \| Common Stock [Member]
Stock Issued For Initial Public Offering, Value	amr_StockIssuedForInitialPublicOfferingValue	$ 4,000
Stock Issued During Period, Shares, Conversion of Convertible Securities	us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	25,875,000
Reclassifications of Temporary to Permanent Equity	us-gaap_ReclassificationsOfTemporaryToPermanentEquity	$ 10,000
Reclassifications Of Temporary To Permanent Equity, Shares	amr_ReclassificationsOfTemporaryToPermanentEquityShares	99,638,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 17,000
Stock Issued During Period, Value, Conversion of Convertible Securities	us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	$ 3,000
Stock Issued For Initial Public Offering, Shares	amr_StockIssuedForInitialPublicOfferingShares	40,000,000
Stock Issued During Period, Shares, Conversion of Units	us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits	(3,000)
Shares, Outstanding	us-gaap_SharesOutstanding	169,372,000

Alta Mesa Resources, Inc. /DE 10-Q