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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, 2022
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]    
Unbilled services (unbilled revenue) $ 709,477 $ 623,121
Change in unbilled services (unbilled revenue) $ 86,356  
Percentage change in unbilled services (unbilled revenue) 13.90%  
Unearned revenue (payments on account) $ (1,191,778) (1,323,961)
Change in unearned revenue (payments on account) $ 132,183  
Percentage change in unearned revenue (payments on account) (10.00%)  
Net balance $ (482,301) $ (700,840)
Change in net balance $ 218,539  
Percentage change in net balance (31.20%)