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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables)
 6 Months Ended
Jun. 30, 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:
June 30, 2023December 31, 2022
(in thousands)
Contract assets:
Billed services (accounts receivable)$1,788,140 $1,751,950 
Unbilled services (unbilled revenue)985,034 957,655 
Accounts receivable and unbilled revenue, gross2,773,174 2,709,605 
Allowance for credit losses(29,029)(20,562)
Accounts receivable and unbilled revenue, net$2,744,145 $2,689,043 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)June 30, 2023December 31, 2022$ Change% Change
Unbilled services (unbilled revenue)$985,034 $957,655 $27,379 2.9 %
Unearned revenue (payments on account)(1,573,311)(1,507,449)(65,862)4.4 %
Net balance$(588,277)$(549,794)$(38,483)7.0 %