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Earnings Per Share - Basic and Diluted earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Earnings Per Share [Abstract]                      
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
Basic (in dollars per share)                 $ 2.49 $ 1.87 $ 5.87
Diluted (in dollars per share)                 $ 2.42 $ 1.82 $ 5.70
Weighted average number of shares outstanding:                      
Basic (in shares)                 151,619 150,367 130,159
Dilutive effect of:                      
Options to purchase common stock                 4,218 3,874 3,685
Other dilutive securities                 548 276 174
Diluted (in shares)                 156,385 154,517 134,018