Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 1,355,978		$ 1,712,504		$ 1,494,632		$ 1,200,371		$ 1,152,015	$ 1,401,860	$ 1,205,017	$ 1,012,367	$ 5,763,485	$ 4,771,259	$ 4,030,347
Adjusted EBITDA													1,024,788	878,723	802,875
Depreciation													(265,817)	(211,744)	(164,247)
Amortization of intangible assets													(79,615)	(71,731)	(31,705)
Stock-based compensation													(85,011)	(130,173)	(64,596)
Acquisition-related and other														(9,829)
Legal reserves, occupancy tax and other													(41,539)	(77,919)	(117,025)
Restructuring and related reorganization charges	(25,630)												(25,630)
Realized gain on revenue hedges													(9,412)	(11,267)	6,422
Operating income	94,706	[1]	296,836	[1]	129,220	[1]	(2,998)	[1]	138,711	238,691	94,286	(105,628)	517,764	366,060	431,724
Other expense, net													(53,123)	(65,367)	(81,667)
Income from continuing operations before income taxes													464,641	300,693	350,057
Provision for income taxes													(91,691)	(84,335)	(47,078)
Income from continuing operations													372,950	216,358	302,979
Discontinued operations, net of taxes															(22,539)
Net income													372,950	216,358	280,440
Net income attributable to noncontrolling interests													25,147	16,492	(269)
Net income attributable to Expedia, Inc.	65,969		257,059		89,373		(14,304)		94,717	170,859	71,500	(104,226)	398,097	232,850	280,171
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA													(398,933)	(357,528)	(323,558)
Depreciation													(110,820)	(92,163)	(77,234)
Amortization of intangible assets													(79,615)	(71,731)	(31,705)
Stock-based compensation													(85,011)	(130,173)	(64,596)
Acquisition-related and other														(9,829)
Legal reserves, occupancy tax and other													(41,539)	(77,919)	(117,025)
Restructuring and related reorganization charges													(25,630)
Operating income													(741,548)	(739,343)	(614,118)
Leisure | Operating Segments
Segment Reporting Information [Line Items]
Revenue													5,363,781	4,406,336	3,738,955
Adjusted EBITDA													1,363,944	1,177,298	1,073,226
Depreciation													(136,121)	(104,632)	(74,982)
Realized gain on revenue hedges													(9,412)	(11,267)	6,422
Operating income													1,218,411	1,061,399	1,004,666
Egencia | Operating Segments
Segment Reporting Information [Line Items]
Revenue													399,704	364,923	291,392
Adjusted EBITDA													59,777	58,953	53,207
Depreciation													(18,876)	(14,949)	(12,031)
Operating income													$ 40,901	$ 44,004	$ 41,176

[1] During the fourth quarter of 2014, we recognized $26 million related to restructuring and related reorganization charges.