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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, 2022
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, 2022December 31, 2021
(in thousands)
Contract assets:
Billed services (accounts receivable)$1,379,131 $1,349,851 
Allowance for credit losses(7,722)(7,081)
Accounts receivable (net)1,371,409 1,342,770 
Unbilled services (unbilled revenue)674,509 623,121 
Accounts receivable and unbilled revenue, net$2,045,918 $1,965,891 
    
Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)March 31, 2022December 31, 2021$ Change% Change
Unbilled services (unbilled revenue)$674,509 $623,121 $51,388 8.2 %
Unearned revenue (payments on account)(1,300,980)(1,323,961)22,981 (1.7)%
Net balance$(626,471)$(700,840)$74,369 (10.6)%