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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 2,319,208	$ 2,965,848	$ 2,586,052	$ 2,188,736	$ 2,092,829	$ 2,580,905	$ 2,195,869	$ 1,903,961	$ 10,059,844	$ 8,773,564	$ 6,672,317
Intersegment revenue									0	0	0
Adjusted EBITDA									1,712,505	1,615,672	1,103,111
Depreciation									(614,099)	(477,061)	(336,680)
Amortization of intangible assets									(275,445)	(317,141)	(156,458)
Impairment of intangible assets					(33,000)				0	(34,890)	(7,207)
Stock-based compensation									(149,350)	(242,417)	(178,068)
Legal reserves, occupancy tax and other									(25,412)	(26,498)	104,587
Restructuring and related reorganization charges									(16,738)	(43,217)	(72,122)
Realized (gain) loss on revenue hedges									(6,323)	(12,746)	(43,597)
Operating income	113,475	481,728	102,768	(72,833)	147,186	386,152	25,662	(97,298)	625,138	461,702	413,566
Other income (expense), net									(208,374)	(185,102)	512,396
Income before income taxes									416,764	276,600	925,962
Provision for income taxes									(45,405)	(15,315)	(203,214)
Net income									371,359	261,285	722,748
Net loss attributable to non-controlling interests									6,605	20,563	41,717
Net income attributable to Expedia, Inc.	$ 55,159	$ 352,238	$ 56,689	$ (86,122)	$ 79,457	$ 279,331	$ 31,649	$ (108,589)	377,964	281,848	764,465
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue									(413,855)	(297,318)	(214,632)
Intersegment revenue									(413,855)	(297,318)	(214,632)
Adjusted EBITDA									(657,414)	(641,168)	(509,747)
Depreciation									(213,787)	(164,956)	(116,850)
Amortization of intangible assets									(275,445)	(317,141)	(156,458)
Impairment of intangible assets										(34,890)	(7,207)
Stock-based compensation									(149,350)	(242,417)	(178,068)
Legal reserves, occupancy tax and other									(25,412)	(26,498)	104,587
Restructuring and related reorganization charges									(16,738)	(43,217)	(72,122)
Realized (gain) loss on revenue hedges									0	0	0
Operating income									(1,338,146)	(1,470,287)	(935,865)
Core OTA
Segment Reporting Information [Line Items]
Revenue									7,880,597	7,083,620	5,877,213
Core OTA | Operating Segments
Segment Reporting Information [Line Items]
Revenue									7,880,597	7,083,620	5,877,213
Intersegment revenue									0	0	0
Adjusted EBITDA									2,068,405	1,965,987	1,600,042
Depreciation									(309,842)	(255,778)	(189,318)
Amortization of intangible assets									0	0	0
Impairment of intangible assets										0	0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0	0	0
Realized (gain) loss on revenue hedges									(6,323)	(12,746)	(43,597)
Operating income									1,752,240	1,697,463	1,367,127
trivago
Segment Reporting Information [Line Items]
Revenue									752,352	538,479	333,024
trivago | Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,166,207	835,797	547,656
Intersegment revenue									413,855	297,318	214,632
Adjusted EBITDA									5,439	34,826	2,856
Depreciation									(9,182)	(7,145)	(2,113)
Amortization of intangible assets									0	0	0
Impairment of intangible assets										0	0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0	0	0
Realized (gain) loss on revenue hedges									0	0	0
Operating income									(3,743)	27,681	743
HomeAway
Segment Reporting Information [Line Items]
Revenue									906,469	689,186	20,222
HomeAway | Operating Segments
Segment Reporting Information [Line Items]
Revenue									906,469	689,186	20,222
Intersegment revenue									0	0	0
Adjusted EBITDA									201,810	175,402	4,011
Depreciation									(40,211)	(17,842)	(742)
Amortization of intangible assets									0	0	0
Impairment of intangible assets										0	0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0	0	0
Realized (gain) loss on revenue hedges									0	0	0
Operating income									161,599	157,560	3,269
Egencia
Segment Reporting Information [Line Items]
Revenue									520,426	462,279	400,115
Egencia | Operating Segments
Segment Reporting Information [Line Items]
Revenue									520,426	462,279	400,115
Intersegment revenue									0	0	0
Adjusted EBITDA									94,265	80,625	68,116
Depreciation									(41,077)	(31,340)	(24,394)
Amortization of intangible assets									0	0	0
Impairment of intangible assets										0	0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0	0	0
Realized (gain) loss on revenue hedges									0	0	0
Operating income									$ 53,188	$ 49,285	43,722
eLong
Segment Reporting Information [Line Items]
Revenue											41,743
eLong | Operating Segments
Segment Reporting Information [Line Items]
Revenue											41,743
Intersegment revenue											0
Adjusted EBITDA											(62,167)
Depreciation											(3,263)
Amortization of intangible assets											0
Impairment of intangible assets											0
Stock-based compensation											0
Legal reserves, occupancy tax and other											0
Restructuring and related reorganization charges											0
Realized (gain) loss on revenue hedges											0
Operating income											$ (65,430)

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