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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Unbilled Services and Unearned Revenue or Payments on Account (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |  |
Unbilled services (unbilled revenue) | $ 709,477 | $ 623,121
Change in unbilled services (unbilled revenue) | $ 86,356 |
Percentage change in unbilled services (unbilled revenue) | 13.90% |
Unearned revenue (payments on account) | $ (1,191,778) | (1,323,961)
Change in unearned revenue (payments on account) | $ 132,183 |
Percentage change in unearned revenue (payments on account) | (10.00%) |
Net balance | $ (482,301) | $ (700,840)
Change in net balance | $ 218,539 |
Percentage change in net balance | (31.20%) |

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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130533-203044 + Details
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