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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |  |
Billed services (accounts receivable) | $ 1,349,851 | $ 722,420 |
Allowance for credit losses (note 19) | (7,081) | (7,149) | $ (7,380)
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 |
Unearned revenue (payments on account) | (1,323,961) | (660,883) |
Net balance | (700,840) | $ (232,199) |
Change in unbilled receivables | 194,437 |  |
Change in unearned revenue (payments on account) | (663,078) |  |
Change in advance payments netted against unbilled contracts receivable | $ (468,641) |  |
Change in unbilled receivables (in percent) | 45.40% |  |
Change in unearned revenue (payments on account) (in percent) | 100.30% |  |
Change in advance payments netted against unbilled contracts receivable (in percent) | (201.80%) |  |

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