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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