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Goodwill and Intangible Assets, Net - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 7,942,023 | $ 7,992,941
Additions | 123,915 | 128
Foreign exchange translation and other |  | (51,046)
Foreign exchange translation and other | 162,927 |
Goodwill, Ending Balance | 8,228,865 | 7,942,023
Core OTA |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 4,703,471 | 4,717,371
Additions | 123,617 | 128
Foreign exchange translation and other |  | (14,028)
Foreign exchange translation and other | 12,949 |
Goodwill, Ending Balance | 4,840,037 | 4,703,471
trivago |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 516,238 | 539,577
Additions | 298 | 0
Foreign exchange translation and other |  | (23,339)
Foreign exchange translation and other | 72,113 |
Goodwill, Ending Balance | 588,649 | 516,238
HomeAway |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 2,590,585 | 2,602,712
Foreign exchange translation and other |  | (12,127)
Foreign exchange translation and other | 64,649 |
Goodwill, Ending Balance | 2,655,234 | 2,590,585
Egencia |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 131,729 | 133,281
Additions | 0 |
Foreign exchange translation and other |  | (1,552)
Foreign exchange translation and other | 13,216 |
Goodwill, Ending Balance | $ 144,945 | $ 131,729

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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