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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, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Contracts with Customers, Asset and Liabilities
Accounts receivable and unbilled revenue are as follows:
December 31, 2021December 31, 2020
(in thousands)
Billed services (accounts receivable)$1,349,851 $722,420 
Allowance for credit losses (note 19)(7,081)(7,149)
Accounts receivable (net)1,342,770 715,271 
Unbilled services (unbilled revenue)$623,121 $428,684 
Accounts receivable and unbilled revenue, net$1,965,891 $1,143,955 

Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)December 31, 2021December 31, 2020$ Change% Change
Unbilled services (unbilled revenue)$623,121 $428,684 $194,437 45.4 %
Unearned revenue (payments on account)(1,323,961)(660,883)(663,078)100.3 %
Net balance$(700,840)$(232,199)$(468,641)(201.8)%