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Acquisitions and Other Investments - Summary of Fair Value of Assets Acquired and Liabilities Assumed in Conjunction with Acquisition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 15, 2015
Sep. 17, 2015
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2016
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Goodwill     $ 8,228,865 $ 7,992,941 $ 7,942,023
Minimum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets     1 year    
Maximum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets     12 years    
Travel Related Companies          
Business Combination, Consideration Transferred [Abstract]          
Replacement restricted stock units and stock options attributable to pre-acquisition service     $ 8,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Cash     5,000    
Intangible assets with definite lives     75,894    
Goodwill     123,915    
Net assets and non-controlling interests acquired     14,595    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Deferred tax liabilities     (20,834)    
Total     $ 193,570    
Weighted average life of acquired intangible assets     3 years 9 months 18 days    
Equity method investment, non-cash consideration     $ 10,000    
HomeAway          
Business Combination, Consideration Transferred [Abstract]          
Fair value of shares of Expedia common stock issued to HomeAway stockholders and equity award holders $ 2,515,755        
Cash consideration for shares 1,027,061        
Replacement restricted stock units and stock options attributable to pre-acquisition service 19,513        
Total purchase consideration 3,562,329        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Cash 900,281        
Other current assets 54,372        
Long-term assets 90,890        
Intangible assets with definite lives 533,279        
Intangible assets with indefinite lives 239,200        
Goodwill 2,613,151        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Deferred revenue (181,837)        
Other current liabilities (109,581)        
Debt (401,580)        
Other long-term liabilities (30,989)        
Deferred tax liabilities (144,857)        
Total 3,562,329        
Accounts receivable gross 24,000        
Accounts receivable estimated to uncollectible $ 1,000        
Weighted average life of acquired intangible assets 5 years 2 months 12 days        
HomeAway | Minimum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets 1 year        
HomeAway | Maximum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets 10 years        
Orbitz Worldwide, Inc.          
Business Combination, Consideration Transferred [Abstract]          
Cash consideration for shares   $ 1,362,362      
Settlement of Orbitz debt   432,231      
Replacement restricted stock units and stock options attributable to pre-acquisition service   16,717      
Other consideration   2,214      
Total purchase consideration   1,813,524      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Cash   194,515      
Accounts receivable, net   150,187      
Other current assets   33,727      
Long-term assets   114,800      
Intangible assets with definite lives   515,003      
Intangible assets with indefinite lives   166,800      
Goodwill   1,444,307      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Current liabilities   (636,169)      
Other long-term liabilities   (54,599)      
Deferred tax liabilities   (115,047)      
Total   1,813,524      
Accounts receivable gross   157,000      
Accounts receivable estimated to uncollectible   $ 7,000      
Weighted average life of acquired intangible assets   6 years 11 days      
Orbitz Worldwide, Inc. | Minimum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets   1 year      
Orbitz Worldwide, Inc. | Maximum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets   10 years      
Other Acquisitions During Period          
Business Combination, Consideration Transferred [Abstract]          
Cash consideration for shares       9,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Intangible assets with definite lives       146,126  
Intangible assets with indefinite lives       163,400  
Goodwill       196,431  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Deferred tax liabilities       (7,910)  
Net liabilities       (23,366)  
Total       $ 474,681  
Weighted average life of acquired intangible assets       5 years 9 months 18 days  
Cash acquired       $ 41,000  
Equity method investment, non-cash consideration       $ 99,000  
Other Acquisitions During Period | Minimum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets       4 years  
Other Acquisitions During Period | Maximum          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Estimated useful lives of acquired intangible assets       10 years