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Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Unbilled service fees | $ 73,446 | $ 49,110
Unbilled outside vendor costs, billable to clients | 16,793 | 10,552
Contract with Customer, Liability, Revenue Recognized |  | 78,780
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligation, amount | 8,033 |
Advance Billings |  |
Disaggregation of Revenue [Line Items] |  |
Advance billings | 211,248 | 152,956
Increase (Decrease) in Contract with Customer, Liability | 58,292 |
Contract with Customer, Liability, Revenue Recognized | $ 118,934 |
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 | 58.00% |
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 | 42.00% |
Accrued Expenses and Other Current Liabilities |  |
Disaggregation of Revenue [Line Items] |  |
Advance billings | $ 118,589 | $ 112,755
Increase (Decrease) in Contract with Customer, Liability | $ 5,834 |

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