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Net Revenues - Schedule of net revenues disaggregated by customer (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Total net revenues $ 1,015,737 $ 935,523 $ 2,949,934 $ 2,758,809
Global clients        
Segment Reporting Information [Line Items]        
Total net revenues 920,628 824,175 2,667,036 2,409,047
GE        
Segment Reporting Information [Line Items]        
Total net revenues $ 95,109 $ 111,348 $ 282,898 $ 349,762