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Contract Balances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Billed services (accounts receivable) $ 1,751,950 $ 1,349,851  
Allowance for credit losses (note 5) (20,562) (7,081) $ (7,149)
Accounts receivable (net) 1,731,388 1,342,770  
Unbilled services (unbilled revenue) 957,655 623,121  
Accounts receivable and unbilled revenue, net 2,689,043 1,965,891  
Unearned revenue (payments on account) (1,507,449) (1,323,961)  
Net balance (549,794) $ (700,840)  
Change in unbilled receivables 334,534    
Change in unearned revenue (payments on account) (183,488)    
Change in advance payments netted against unbilled contracts receivable $ 151,046    
Change in unbilled receivables (in percent) 53.70%    
Change in unearned revenue (payments on account) (in percent) 13.90%    
Change in advance payments netted against unbilled contracts receivable (in percent) 21.60%