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Contract Balances - Contracts with Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]      
Billed services (accounts receivable) $ 1,821,855 $ 1,751,950  
Allowance for credit losses (note 5) (31,533) (20,562) $ (7,081)
Accounts receivable (net) 1,790,322 1,731,388  
Unbilled services (unbilled revenue) 951,936 957,655  
Accounts receivable and unbilled revenue, net 2,742,258 2,689,043  
Unearned revenue (payments on account) (1,654,507) (1,507,449)  
Net balance (702,571) $ (549,794)  
Change in unbilled receivables (5,719)    
Change in unearned revenue (payments on account) (147,058)    
Change in advance payments netted against unbilled contracts receivable $ (152,777)    
Change in unbilled receivables (in percent) (0.60%)    
Change in unearned revenue (payments on account) (in percent) 9.80%    
Change in advance payments netted against unbilled contracts receivable (in percent) 27.80%