Acquisitions and Dispositions - Additional Information (Detail)	6 Months Ended			6 Months Ended	1 Months Ended	6 Months Ended		6 Months Ended			1 Months Ended
	Jun. 30, 2013 USD ($)		Dec. 31, 2012 USD ($)	Jun. 30, 2013 Acquisition-related and other USD ($)	Mar. 08, 2013 Trivago USD ($)	Jun. 30, 2013 Trivago USD ($)	Mar. 08, 2013 Trivago EUR (€)	Jun. 30, 2013 Trivago Acquisition-related and other USD ($)	Jun. 30, 2013 During the first quarter of 2016	Jun. 30, 2013 During the first quarter of 2018	Jan. 19, 2012 8.5% Senior Notes Due 2016 USD ($)	Dec. 20, 2011 8.5% Senior Notes Due 2016 USD ($)
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
Business acquisition, cash paid to settle portion of employee compensation plan	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]				66,472,000
Stock-based compensation				56,643,000				56,643,000
Aggregate purchase consideration					570,000,000
Goodwill	3,643,196,000		3,015,670,000		635,565,000
Percentage of noncontrolling interest					37.00%
Fair value of noncontrolling interest					343,984,000
Minority shareholders right to sell on remaining shares of trivago									50.00%	100.00%
Senior notes, interest rate												8.50%
Senior unsecured notes principal amount												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 $ 764 $ 803 $ 1,825 $ 1,722 Selling and marketing 3,649 3,248 7,914 7,693 Technology and content 4,692 3,874 10,087 8,158 General and administrative 6,981 8,696 14,695 15,999 Acquisition-related and other - - 56,643 -