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Revenues Revenue - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Performance obligation satisfied in previous period | $ 10,900 | $ 9,600 | $ 22,400 | $ 10,400 |
Contract asset after allowance for credit loss | 55,400 |  | 55,400 |  | $ 70,100
Increase (decrease) in contract asset |  |  | 14,700 |  |
Deferred revenues | 27,703 |  | 27,703 |  | $ 22,461
Increase (decrease) in performance obligation |  |  | 5,200 |  |
Revenue recognized | 1,700 |  | 21,300 |  |
Remaining performance obligation | 186,100 |  | 186,100 |  |
Revenues before reimbursable expenses | 378,089 | 367,466 | 1,122,491 | 1,048,750 |
Release of allowance |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Performance obligation satisfied in previous period | 1,800 | 2,500 | 3,300 | 1,300 |
Change in estimated variable consideration |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Performance obligation satisfied in previous period | $ 9,100 | $ 7,100 | $ 19,100 | $ 9,100 |

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