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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables)
 12 Months Ended
Dec. 31, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Accounts Receivables and Unbilled Revenue, and Unbilled Services and Unearned Revenue
Accounts receivable and unbilled revenue are as follows:
December 31, 2024December 31, 2023
(in thousands)
Billed services (accounts receivable)$1,437,653 $1,821,855 
Allowance for credit losses (note 5)(35,664)(31,533)
Accounts receivable (net)1,401,989 1,790,322 
Unbilled services (unbilled revenue)1,286,274 951,936 
Accounts receivable and unbilled revenue, net$2,688,263 $2,742,258 

Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
December 31, 2024December 31, 2023$ Change% Change
(in thousands, except percentages)
Unbilled services (unbilled revenue)$1,286,274 $951,936 $334,338 35.1 %
Unearned revenue (payments on account)(1,614,758)(1,654,507)39,749 (2.4)%
Net balance$(328,484)$(702,571)$374,087 (53.2)%