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Net revenues - Schedule of net revenues disaggregated by customer (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total net revenues $ 4,022,211 $ 3,709,377 $ 3,520,543
Global Clients      
Segment Reporting Information [Line Items]      
Total net revenues 3,646,007 3,250,527 3,042,452
GE      
Segment Reporting Information [Line Items]      
Total net revenues $ 376,204 $ 458,850 $ 478,091