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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Accounts Receivables and Unbilled Revenue (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Contract Assets [Abstract]    
Billed services (accounts receivable) $ 1,883,296 $ 1,751,950
Unbilled services (unbilled revenue) 941,884 957,655
Accounts receivable and unbilled revenue, gross 2,825,180 2,709,605
Allowance for credit losses (32,934) (20,562)
Accounts receivable and unbilled revenue, net $ 2,792,246 $ 2,689,043