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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
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]    
Unbilled services (unbilled revenue) $ 1,230,948 $ 951,936
Change in unbilled services (unbilled revenue) $ 279,012  
Percentage change in unbilled services (unbilled revenue) 29.30%  
Unearned revenue (payments on account) $ (1,602,526) (1,654,507)
Change in unearned revenue (payments on account) $ 51,981  
Percentage change in unearned revenue (payments on account) (3.10%)  
Net balance $ (371,578) $ (702,571)
Change in net balance $ 330,993  
Percentage change in net balance (47.10%)