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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Amounts due to third parties for reimbursable expenses | $ 323,600 | $ 138,200
Change in unbilled receivables | 194,437 |
Change in unearned revenue (payments on account) | 663,078 |
Increase in advance payments netted against unbilled contracts receivable | (468,641) |
Bad debt expense | 900 | $ 2,900
Revenue, remaining performance obligation, amount | $ 13,300,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, remaining performance obligation (in percent) | 48.00% |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 12 months |

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- Definition Change in Advance Payments Netted Against Unbilled Contracts Receivable + References No definition available. + Details
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- Definition Increase (Decrease) In Contracts With Customers, Liability, Current + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 + Details
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