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Segment Information - Summary of Revenues and Property and Equipment, Net by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Revenues $ 956,050 $ 1,004,236 $ 2,710,103 $ 2,954,688  
Property and Equipment, Net 105,895   105,895   $ 121,027
North America          
Segment Reporting Information [Line Items]          
Revenues 804,122 831,367 2,245,515 2,429,357  
Property and Equipment, Net 102,352   102,352   116,460
Middle East          
Segment Reporting Information [Line Items]          
Revenues 147,207 168,043 448,525 511,591  
Property and Equipment, Net 3,543   3,543   $ 4,567
Rest of World          
Segment Reporting Information [Line Items]          
Revenues $ 4,721 $ 4,826 $ 16,063 $ 13,740