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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Unbilled Services and Unearned Revenue or Payments on Account (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]    
Unbilled services (unbilled revenue) $ 993,141 $ 951,936
Change in unbilled services (unbilled revenue) $ 41,205  
Percentage change in unbilled services (unbilled revenue) 4.30%  
Unearned revenue (payments on account) $ (1,709,938) (1,654,507)
Change in unearned revenue (payments on account) $ (55,431)  
Percentage change in unearned revenue (payments on account) 3.40%  
Net balance $ (716,797) $ (702,571)
Change in net balance $ 14,226  
Percentage change in net balance 2.00%