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Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Aug. 02, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Unbilled service fees | $ 116,558 |  | $ 30,570
Unbilled outside vendor costs, billable to clients | 63,065 |  | 11,063
Advance billings | 361,885 |  | $ 66,418
Increase in contract liability balance | 295,467 |  |
Revenue recognized | 64,446 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation, amount | $ 22,812 |  |
MDC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Advance billings |  | $ (211,403) |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Expected timing of satisfaction | 1 year |  |
Remaining performance obligation | 93.00% |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Expected timing of satisfaction |  |  |
Remaining performance obligation | 7.00% |  |
Accrued Expenses and Other Current Liabilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Increase in contract assets | $ 99,853 |  |

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