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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Accounts Receivables and Unbilled Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
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

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Contracts Receivable

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- Definition

Contracts Receivable, Net

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

+ References

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-Publisher FASB
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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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