Acquisitions (Schedule of Estimated Weighted Average Amortization Periods For Intangible Assets) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	12 years 8 months 12 days	12 years 9 months 18 days
Trademarks And Domain Names [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	16 years 6 months	16 years 6 months
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	8 years 10 months 24 days	9 years
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	6 years 3 months 18 days	6 years 2 months 12 days
Non-compete Covenants [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	3 years	3 years
Next Advisor, Inc. [Member] \| Trademarks And Domain Names [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	5 years
Next Advisor, Inc. [Member] \| Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	8 years
Next Advisor, Inc. [Member] \| Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	2 years
Next Advisor, Inc. [Member] \| Non-compete Covenants [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period Years	3 years

Bankrate, Inc. 10-Q