Acquisitions and Dispositions - Additional Information (Detail)	3 Months Ended				3 Months Ended	1 Months Ended				3 Months Ended			3 Months Ended
	Mar. 31, 2013 USD ($)		Mar. 08, 2013 USD ($)	Mar. 08, 2013 EUR (€)	Mar. 31, 2013 Acquisition-related and other USD ($)	Jan. 19, 2012 8.5% Senior Notes Due 2016 USD ($)	Dec. 31, 2011 8.5% Senior Notes Due 2016 USD ($)	Mar. 31, 2013 During the first quarter of 2016	Mar. 31, 2013 During the first quarter of 2018	Mar. 31, 2013 Trivago USD ($)	Mar. 08, 2013 Trivago USD ($)	Mar. 08, 2013 Trivago EUR (€)	Mar. 31, 2013 Trivago Acquisition-related and other USD ($)
Acquisitions And Discontinued Operations [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	553,834,000										553,834,000
Business acquisition, cash consideration	9,829,000										9,829,000
Business acquisition, common stock consideration												43,000,000
Business acquisition, common stock consideration, shares										875,200
Business acquisition, fair value of replaced employee stock-based awards of acquiree											15,000,000
Business acquisition, amount expensed at acquisition	66,472,000	[1]								66,000,000
Stock-based compensation					56,643,000								56,643,000
Aggregate purchase consideration											570,000,000
Goodwill	637,135,000		637,135,000
Percentage of noncontrolling interest			37.00%	37.00%
Fair value of noncontrolling interest			344,000,000
Minority shareholders right to sell on remaining shares of trivago								50.00%	100.00%
Senior notes, interest rate						8.50%	8.50%
Senior unsecured notes principal amount						400,000,000	400,000,000
Redemption of senior notes and accrued interest on senior notes						450,000,000
Loss from early extinguishment of debt, pre-tax						(38,000,000)
Loss from early extinguishment of debt, net of tax						(24,000,000)
Redemption premium of senior note						33,000,000
Write-off of unamortized debt issuance and discount costs						$ 5,000,000

[1] Includes stock-based compensation as follows: Cost of revenue $ 1,061 $ 919 Selling and marketing 4,265 4,445 Technology and content 5,395 4,284 General and administrative 7,714 7,303 Acquisition-related and other 56,643 -