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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
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