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Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Unbilled service fees |  | $ 137,938 | $ 30,570
Unbilled outside vendor costs, billable to clients |  | 37,101 | 11,063
Advance billings |  | 286,790 | 66,418
Increase (Decrease) in Contract with Customer, Liability |  | 220,372 |
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination |  | 211,687 |
Contract with Customer, Liability, Revenue Recognized | $ 9,311 | 45,432 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation, amount |  | $ 8,498 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  | 1 year |
Revenue, Remaining Performance Obligation, Percentage |  | 35.00% |
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, Expected Timing of Satisfaction, Period |  | 1 year |
Revenue, Remaining Performance Obligation, Percentage |  | 60.00% |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Percentage |  | 4.00% |
Accrued Expenses and Other Current Liabilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Advance billings |  | $ 168,882 | $ 9,311
Increase (Decrease) in Contract with Customer, Liability |  | 159,571 |
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination |  | $ 108,488 |

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- Definition Gross amount of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing. + References No definition available. + Details
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