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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables)
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of accounts receivables and unbilled revenue, and unbilled services and unearned revenue
Accounts receivables and unbilled revenue are as follows:
March 31, 2023December 31, 2022
(in thousands)
Contract assets:
Billed services (accounts receivable)$1,838,875 $1,751,950 
Unbilled services (unbilled revenue)974,260 957,655 
Accounts receivable and unbilled revenue, gross2,813,135 2,709,605 
Allowance for credit losses(36,149)(20,562)
Accounts receivable and unbilled revenue, net$2,776,986 $2,689,043 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)March 31, 2023December 31, 2022$ Change% Change
Unbilled services (unbilled revenue)$974,260 $957,655 $16,605 1.7 %
Unearned revenue (payments on account)(1,580,235)(1,507,449)(72,786)4.8 %
Net balance$(605,975)$(549,794)$(56,181)10.2 %