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Acquisitions and Other Investments - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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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 ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Business | Jul. 27, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  | $ 410,000 |  |  |  |  |  |  |  | $ 410,000 |  |  |
Goodwill |  |  |  |  |  |  |  | 8,228,865 |  |  |  | $ 7,942,023 |  |  |  | 8,228,865 | $ 7,942,023 | $ 7,992,941 |
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 |
Operating loss |  |  |  |  |  |  |  | 113,475 | $ 481,728 | $ 102,768 | $ (72,833) | 147,186 | $ 386,152 | $ 25,662 | $ (97,298) | 625,138 | 461,702 | 413,566 |
Restructuring charges | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,738 | 55,907 | 104,871 |
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,000 |
Core OTAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 4,840,037 |  |  |  | 4,703,471 |  |  |  | 4,840,037 | 4,703,471 | 4,717,371 |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,880,597 | 7,083,620 | 5,877,213 |
Traveloka Holding Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000
Decolar.com, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost method investment |  |  |  |  | $ 273,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Travel Related Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, equity interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000 |  |  |
Goodwill |  |  |  |  |  |  |  | 123,915 |  |  |  |  |  |  |  | 123,915 |  |  |
Deductible for tax purposes |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  | 12,000 |  |  |
Business acquisition, cash acquired |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  | $ 5,000 |  |  |
Weighted average life of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 9 months 18 days |  |  |
HomeAway |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HomeAway | Convertible Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount repurchased |  |  |  |  |  |  |  |  |  |  |  | $ 401,000 |  |  |  |  | $ 401,000 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 196,431 |
Business acquisition, cash consideration paid to shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |
Number of business acquisition | Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Deductible for tax purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,000 |
Business acquisition, deferred tax liabilities acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,910 |
Weighted average life of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 9 months 18 days |
[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

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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