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Stockholders' Equity - Effects of Changes in Noncontrolling Interest (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 21, 2015
Noncontrolling Interest [Line Items]                        
Net income attributable to Expedia, Inc. $ 55,159 $ 352,238 $ 56,689 $ (86,122) $ 79,457 $ 279,331 $ 31,649 $ (108,589) $ 377,964 $ 281,848 $ 764,465  
Net decrease in Expedia, Inc.’s paid-in capital related to trivago IPO                   0    
Net increase (decrease) in Expedia, Inc.’s paid-in capital for newly issued eLong shares and other equity activity                     92,550  
Net transfers from non-controlling interest                 5,811 274 5,807  
Change from net income attributable to Expedia, Inc. and transfers from non-controlling interest                 380,613 249,707 760,267  
Additional paid-in capital                        
Noncontrolling Interest [Line Items]                        
Net decrease in Expedia, Inc.’s paid-in capital related to trivago IPO                 0 (32,141) 0  
Net increase (decrease) in Expedia, Inc.’s paid-in capital for newly issued eLong shares and other equity activity                 0 0 (4,198)  
Other                 2,649 0 0  
Net transfers from non-controlling interest                 $ 2,649 $ (32,141) $ (4,198)  
Air Asia Expedia                        
Noncontrolling Interest [Line Items]                        
Ownership interest percentage 75.00%       75.00%       75.00% 75.00% 75.00%  
Trivago                        
Noncontrolling Interest [Line Items]                        
Ownership interest percentage 59.60%       59.70%       59.60% 59.70%    
eLong                        
Noncontrolling Interest [Line Items]                        
Ownership interest percentage                       62.40%