Acquisitions and Other Investments - Additional Information (Detail) AUD / shares in Units, $ / shares in Units, $ in Thousands, shares in Millions, AUD in Millions						1 Months Ended			3 Months Ended									12 Months Ended
	Dec. 16, 2015 USD ($)	Dec. 15, 2015 USD ($) $ / shares shares	Sep. 17, 2015 USD ($) $ / shares	Mar. 10, 2015 USD ($)	Jan. 23, 2015 USD ($)	Jan. 31, 2016 USD ($)	Nov. 30, 2014 AUD AUD / shares	Nov. 30, 2014 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($) Business		Dec. 31, 2014 USD ($)		Nov. 30, 2014 USD ($)	Nov. 13, 2014 USD ($) $ / shares
Business Acquisition [Line Items]
Unrecognized stock-based compensation expense									$ 385,000									$ 385,000
Goodwill									7,942,023				$ 7,992,941				$ 3,955,901	7,942,023		$ 7,992,941		$ 3,955,901
Revenue									2,092,829	$ 2,580,905	$ 2,195,869	$ 1,903,961	1,698,567	$ 1,937,753	$ 1,662,600	$ 1,373,397		8,773,564		6,672,317		5,763,485
Operating loss									147,186	$ 386,152	$ 25,662	$ (97,298)	29,477	$ 344,998	$ 90,092	$ (51,001)		461,702		413,566		517,764
Restructuring charges													23,000				26,000	55,907	[1]	104,871	[1]	25,630	[1]
Business acquisitions, equity interest to fair value gain																		0		77,400		0
Cost method investment									323,000				339,000					323,000		339,000
Acquisition-related costs																				47,000
Core OTAs
Business Acquisition [Line Items]
Goodwill									4,703,471				4,717,371				3,133,495	4,703,471		4,717,371		3,133,495
Revenue																		7,083,620		5,877,213		4,905,150
Decolar.com, Inc.
Business Acquisition [Line Items]
Cost method investment				$ 270,000
Home Away Inc
Business Acquisition [Line Items]
Aggregate purchase consideration		$ 3,562,329
Business acquisitions, cash price per share | $ / shares		$ 10.15
Business combination, price acquiree stock shares exchange		0.2065
Number of common shares of the acquiree, outstanding | shares		97.0
Business acquisition, common stock consideration, shares | shares		20.0
Business acquisitions, equity interest		$ 19,513
Unrecognized stock-based compensation expense		106,000
Goodwill		2,613,151
Convertible senior notes debt		$ 401,580
Senior notes, interest rate		0.125%
Convertible senior notes maturity year		2019
Debt instrument redemption price percentage		100.00%
Warrants acquired | shares		7.7
Warrants, settled amount	$ 23,000					$ 8,000
Revenue																				20,000
Operating loss																				(14,000)
Fees contingent upon change of control		$ 33,000
Business acquisition, cash consideration paid to shareholders		1,027,061
Business acquisition, cash acquired		900,281
Business acquisition, deferred tax liabilities acquired		$ 144,857
Weighted average life of acquired intangible assets		5 years 2 months 12 days
Home Away Inc | Convertible Notes Payable
Business Acquisition [Line Items]
Debt, amount repurchased									401,000									401,000
Debt outstanding									$ 1,000									$ 1,000
Orbitz Worldwide, Inc.
Business Acquisition [Line Items]
Aggregate purchase consideration			$ 1,813,524
Business acquisitions, cash price per share | $ / shares			$ 12
Business acquisitions, equity interest			$ 16,717
Goodwill			1,444,307
Revenue																				196,000
Operating loss																				(163,000)
Fees contingent upon change of control			25,000
Business acquisition, cash consideration paid to shareholders			1,362,362
Business acquisitions, debt repayment			432,231
Post acquisition employee restricted stock award, net of estimated forfeitures, fair value			49,000
Stock-based compensation recognized																				34,000
Restructuring charges																				92,000
Business combination, continuity incentive			$ 30,000
Business combination, continuity incentive remaining payment period			180 days
Business acquisition, cash acquired			$ 194,515
Business acquisition, deferred tax liabilities acquired			$ 115,047
Weighted average life of acquired intangible assets			6 years 11 days
AAE Travel Private Limited
Business Acquisition [Line Items]
Percentage of equity interest acquired				25.00%
Additional equity interest, approximate cash consideration				$ 94,000
Total ownership in venture before acquisition of additional equity interest				50.00%
Total ownership in venture after acquisition of additional equity interest				75.00%
Business acquisitions, equity interest to fair value gain				$ 77,000
Percentage of noncontrolling interest				25.00%
Fair value of noncontrolling interest				$ 64,000
Travelocity
Business Acquisition [Line Items]
Business acquisition, cash consideration paid to shareholders					$ 280,000
Other Acquisitions During Period
Business Acquisition [Line Items]
Aggregate purchase consideration																						85,000
Business acquisitions, equity interest																						7,000
Goodwill													196,431				70,000			196,431		70,000
Business acquisition, cash consideration paid to shareholders																				$ 9,000		77,000
Business acquisitions, equity interest to fair value gain																						3,000
Number of business acquisition | Business																				3
Deductible for tax purposes													82,000							$ 82,000
Business acquisition, net assets (liabilities) acquired													(23,366)				(19,000)			(23,366)		(19,000)
Business acquisition, cash acquired																	48,000					48,000
Business acquisition, deferred tax liabilities acquired													$ 7,910				$ 17,000			$ 7,910		17,000
Intangible assets with definite lives																						$ 51,000
Weighted average life of acquired intangible assets																				5 years 9 months 18 days		6 years 1 month 6 days
Wotif Group
Business Acquisition [Line Items]
Aggregate purchase consideration							AUD 652	$ 568,000
Business acquisitions, cash price per share | (per share)							AUD 3.30																		$ 2.87
Goodwill																								$ 350,093
Acquisition-related costs								$ 7,000
Business acquisition, total cash paid							AUD 703																		$ 612,000
Special dividend distributed | AUD							AUD 51
Business acquisition, deferred tax liabilities acquired																								$ 2,908
Weighted average life of acquired intangible assets							7 years 9 months 18 days	7 years 9 months 18 days

[1] (1) Includes stock-based compensation as follows: Cost of revenue$11,388 $5,307 $3,921Selling and marketing46,654 33,164 18,067Technology and content63,536 26,766 22,100General and administrative108,149 80,082 40,923Restructuring and related reorganization charges12,690 32,749 —