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v3.21.2

Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |  |
Billed services (accounts receivable) | $ 1,345,588 | $ 722,420
Unbilled services (unbilled revenue) | 550,692 | 428,684
Accounts receivable and unbilled revenue | 1,896,280 | 1,151,104
Allowance for credit losses | (7,262) | (7,149)
Accounts receivable and unbilled revenue, net | 1,889,018 | 1,143,955
Change in unbilled services (unbilled revenue) | $ 122,008 |
Percentage change in unbilled services (unbilled revenue) | 28.50% |
Unearned revenue (payments on account) | $ (1,349,000) | (660,883)
Change in unearned revenue (payments on account) | $ (688,117) |
Percentage change in unearned revenue (payments on account) | 104.10% |
Net balance | $ (798,308) | $ (232,199)
Change in net balance | $ (566,109) |
Percentage change in net balance | 243.80% |

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