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Contract Balances - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Amounts due to third parties for reimbursable expenses | $ 333,000 | $ 406,300
Change in unbilled receivables | (5,719) |
Change in unearned revenue (payments on account) | (147,058) |
Increase in advance payments netted against unbilled contracts receivable | (152,777) |
Bad debt expense | 24,600 | 17,800
Revenue, remaining performance obligation, amount | $ 14,800,000 | $ 13,700,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, remaining performance obligation (in percent) |  | 52.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period | 12 months |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, remaining performance obligation (in percent) | 52.00% |
Revenue, remaining performance obligation, expected timing of satisfaction, period |  | 12 months

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