Acquisitions - Additional Information (Detail)	3 Months Ended		0 Months Ended	3 Months Ended			3 Months Ended
	Mar. 31, 2013 USD ($)		Mar. 08, 2013 Trivago USD ($)	Mar. 31, 2014 Trivago	Mar. 31, 2013 Trivago USD ($)	Mar. 08, 2013 Trivago EUR (€)	Mar. 31, 2018 Trivago Scenario, Forecast Maximum	Mar. 31, 2016 Trivago Scenario, Forecast Maximum
Business Acquisition [Line Items]
Percentage of equity position acquired					63.00%
Percentage of fully diluted basis acquired					61.60%
Business acquisition, total cash paid			$ 564,000,000			€ 434,000,000
Business acquisition, cash consideration paid to shareholders			554,000,000
Business acquisition, cash paid to settle portion of employee compensation plan	9,829,000		9,829,000
Business acquisition, common stock consideration, shares			875,200
Business acquisition, amount expensed at acquisition	66,472,000	[1]			66,472,000
Stock-based compensation					$ 56,643,000
Business acquisition, increment of shares issued during the period				175,040
Minority shareholders right to sell on remaining shares of trivago							100.00%	50.00%

[1] Includes stock-based compensation as follows: Cost of revenue $ 1,202 $ 1,061 Selling and marketing 5,335 4,265 Technology and content 5,558 5,395 General and administrative 12,726 7,714 Acquisition-related and other - 56,643