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Segments and Geographic Information - Summary of Revenues and Long-lived Assets by Services Provided in Geographic Region (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues      
Total revenues $ 3,155,671 $ 3,785,063 $ 3,707,628
Long-Lived Assets      
Total long-lived assets 80,016 114,690  
North America [Member]      
Revenues      
Total revenues 2,791,282 3,324,019 3,257,937
Long-Lived Assets      
Total long-lived assets 72,722 107,940  
International [Member]      
Revenues      
Total revenues 363,433 461,044 $ 449,691
Long-Lived Assets      
Total long-lived assets $ 7,294 $ 6,750