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Income Taxes - Schedule of Statutory Federal Income Tax Rate to Income from Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense at the federal statutory rate of 35%	$ 145,867	$ 96,810	$ 324,087
Foreign tax rate differential	(81,509)	(66,947)	(162,784)
Unrecognized tax benefits and related interest	27,690	33,170	33,362
Change in valuation allowance	3,686	(13,924)	27,320
Return to provision true-ups	686	(14,420)	(8,875)
Pay-to-play penalties	0	0	(11,222)
Acquisition related costs	1,554	1,611	12,545
Federal research and development credit	(16,000)	(15,000)	(11,500)
trivago stock-based-compensation	5,011	16,956	0
Excess tax benefits related to stock-based compensation	(59,668)	(39,751)	0
Tax Act transition tax	144,167	0	0
U.S. statutory tax rate change	(158,286)	0	0
Other, net	32,207	16,810	281
Income tax expense	$ 45,405	$ 15,315	$ 203,214

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