XML 50 R42.htm IDEA: XBRL DOCUMENT v3.25.1
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, 2025
Dec. 31, 2024
Revenue from Contract with Customer [Abstract]    
Unbilled services (unbilled revenue) $ 1,197,080 $ 1,286,274
Change in unbilled services (unbilled revenue) $ (89,194)  
Percentage change in unbilled services (unbilled revenue) (6.90%)  
Unearned revenue (payments on account) $ (1,497,166) (1,614,758)
Change in unearned revenue (payments on account) $ 117,592  
Percentage change in unearned revenue (payments on account) (7.30%)  
Net balance $ (300,086) $ (328,484)
Change in net balance $ 28,398  
Percentage change in net balance (8.60%)