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Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Unbilled service fees | $ 59,143 | $ 49,110
Unbilled outside vendor costs, billable to clients | 22,824 | 10,552
Contract with Customer, Liability, Revenue Recognized |  | 69,699
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligation, amount | 5,799 |
Advance Billings |  |
Disaggregation of Revenue [Line Items] |  |
Advance billings | 170,159 | 152,956
Increase (Decrease) in Contract with Customer, Liability | 17,203 |
Contract with Customer, Liability, Revenue Recognized | $ 99,188 |
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 | 83.00% |
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 | 17.00% |
Accrued Expenses and Other Current Liabilities |  |
Disaggregation of Revenue [Line Items] |  |
Advance billings | $ 97,075 | $ 112,755
Increase (Decrease) in Contract with Customer, Liability | $ 15,680 |

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