Guarantor and Non-Guarantor Supplemental Financial Information - Schedule of Statement of Operations Information (Details) - 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
Condensed Income Statements, Captions [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
Costs and expenses:
Cost of revenue										1,756,531	1,596,698	[1]	1,309,559	[1]
Selling and marketing										5,297,832	4,367,417	[1]	3,381,086	[1]
Technology and content										1,386,787	1,235,019	[1]	830,244	[1]
General and administrative										675,961	678,292	[1]	573,913	[1]
Amortization of intangible assets										275,445	317,141		156,458
Impairment of intangible assets						33,000				0	34,890		7,207
Legal reserves, occupancy tax and other										25,412	26,498		(104,587)
Restructuring and related reorganization charges	[1]									16,738	55,907		104,871
Intercompany (income) expense, net										0	0		0
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):
Equity in pre-tax earnings of consolidated subsidiaries										0	0		0
Gain on sale of business										0	0		508,810
Other, net										(208,374)	(185,102)		3,586
Total 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 income (loss) attributable to noncontrolling 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
Comprehensive income attributable to Expedia, Inc.										509,430	280,297		618,345
Reportable Legal Entities | Parent
Condensed Income Statements, Captions [Line Items]
Revenue										0	0		0
Costs and expenses:
Cost of revenue										0	0		0
Selling and marketing										0	0		0
Technology and content										0	0		0
General and administrative										0	0		0
Amortization of intangible assets										0	0		0
Impairment of intangible assets											0		0
Legal reserves, occupancy tax and other										0	0		0
Restructuring and related reorganization charges										0	0		0
Intercompany (income) expense, net										0	0		0
Operating income										0	0		0
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										493,013	383,883		839,779
Gain on sale of business													0
Other, net										(179,541)	(162,455)		(119,451)
Total other income (expense), net										313,472	221,428		720,328
Income before income taxes										313,472	221,428		720,328
Provision for income taxes										64,492	60,420		44,137
Net income										377,964	281,848		764,465
Net income (loss) attributable to noncontrolling interests										0	0		0
Net income attributable to Expedia, Inc.										377,964	281,848		764,465
Comprehensive income attributable to Expedia, Inc.										509,430	280,297		763,202
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue										7,661,878	6,807,279		5,194,549
Costs and expenses:
Cost of revenue										1,342,847	1,263,828		1,009,785
Selling and marketing										3,714,710	3,071,762		2,347,919
Technology and content										991,291	903,444		584,560
General and administrative										408,949	429,015		373,162
Amortization of intangible assets										181,778	248,634		58,524
Impairment of intangible assets											0		0
Legal reserves, occupancy tax and other										25,412	26,498		(104,587)
Restructuring and related reorganization charges										4,924	30,322		76,422
Intercompany (income) expense, net										695,328	656,273		742,010
Operating income										296,639	177,503		106,754
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										336,300	286,016		870,108
Gain on sale of business													0
Other, net										(59,547)	(21,206)		64,576
Total other income (expense), net										276,753	264,810		934,684
Income before income taxes										573,392	442,313		1,041,438
Provision for income taxes										(67,406)	(50,168)		(194,251)
Net income										505,986	392,145		847,187
Net income (loss) attributable to noncontrolling interests										846	0		0
Net income attributable to Expedia, Inc.										506,832	392,145		847,187
Comprehensive income attributable to Expedia, Inc.										698,106	373,649		822,898
Reportable Legal Entities | Non-Guarantor Subsidiaries(1)
Condensed Income Statements, Captions [Line Items]
Revenue										2,817,310	2,267,516		1,682,677
Costs and expenses:
Cost of revenue										430,662	346,200		308,463
Selling and marketing										1,985,541	1,583,993		1,230,059
Technology and content										395,504	331,230		245,495
General and administrative										266,951	249,185		200,268
Amortization of intangible assets										93,667	68,507		97,934
Impairment of intangible assets											34,890		7,207
Legal reserves, occupancy tax and other										0	0		0
Restructuring and related reorganization charges										11,814	25,585		28,449
Intercompany (income) expense, net										(695,328)	(656,273)		(742,010)
Operating income										328,499	284,199		306,812
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										0	0		0
Gain on sale of business													508,810
Other, net										30,714	(1,441)		58,461
Total other income (expense), net										30,714	(1,441)		567,271
Income before income taxes										359,213	282,758		874,083
Provision for income taxes										(42,491)	(25,567)		(53,100)
Net income										316,722	257,191		820,983
Net income (loss) attributable to noncontrolling interests										5,759	20,563		41,717
Net income attributable to Expedia, Inc.										322,481	277,754		862,700
Comprehensive income attributable to Expedia, Inc.										563,978	238,299		742,132
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenue										(419,344)	(301,231)		(204,909)
Costs and expenses:
Cost of revenue										(16,978)	(13,330)		(8,689)
Selling and marketing										(402,419)	(288,338)		(196,892)
Technology and content										(8)	345		189
General and administrative										61	92		483
Amortization of intangible assets										0	0		0
Impairment of intangible assets											0		0
Legal reserves, occupancy tax and other										0	0		0
Restructuring and related reorganization charges										0	0		0
Intercompany (income) expense, net										0	0		0
Operating income										0	0		0
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										(829,313)	(669,899)		(1,709,887)
Gain on sale of business													0
Other, net										0	0		0
Total other income (expense), net										(829,313)	(669,899)		(1,709,887)
Income before income taxes										(829,313)	(669,899)		(1,709,887)
Provision for income taxes										0	0		0
Net income										(829,313)	(669,899)		(1,709,887)
Net income (loss) attributable to noncontrolling interests										0	0		0
Net income attributable to Expedia, Inc.										(829,313)	(669,899)		(1,709,887)
Comprehensive income attributable to Expedia, Inc.										$ (1,262,084)	$ (611,948)		$ (1,709,887)

[1] (1) Includes stock-based compensation as follows: Cost of revenue$10,173 $11,388 $5,307Selling and marketing39,855 46,654 33,164Technology and content54,633 63,536 26,766General and administrative44,689 108,149 80,082Restructuring and related reorganization charges— 12,690 32,749