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Goodwill and Intangible Assets - Summary of Change in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Beginning Balance $ 2,633,251 $ 2,552,369
Acquired   82,402
Adjustments 3,295 (1,520)
Ending Balance 2,636,546 2,633,251
Travel Solutions    
Goodwill [Roll Forward]    
Beginning Balance 2,478,440 2,396,152
Acquired   82,402
Adjustments (2,239) (114)
Ending Balance 2,476,201 2,478,440
Hospitality Solutions    
Goodwill [Roll Forward]    
Beginning Balance 154,811 156,217
Acquired   0
Adjustments 5,534 (1,406)
Ending Balance $ 160,345 $ 154,811