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Equity-Based Compensation - Class B Plans (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 10, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Class B Units |  |  |  |  |
Equity-Based Compensation |  |  |  |  |
Percentage of Time-Based Vesting Units |  |  |  | 50.00% |
Percentage of Performance-Based Vesting Units |  |  |  | 50.00% |
Compensation expense |  | $ 8,165 | $ 1,181 | $ 20,846 | $ 2,286
Time Based Class B Units |  |  |  |  |
Equity-Based Compensation |  |  |  |  |
Vesting period |  |  |  | 5 years |
Service period |  |  |  | 5 years |
Compensation expense |  | 767 |  | $ 2,298 |
Unrecognized share-based compensation expense |  | 7,230 |  | 7,230 |
Performance Based Class B Units |  |  |  |  |
Equity-Based Compensation |  |  |  |  |
Compensation expense |  | 3,120 |  | 10,144 |
Unrecognized share-based compensation expense |  | $ 14,072 |  | $ 14,072 |
Performance Based Class B Units | Maximum |  |  |  |  |
Equity-Based Compensation |  |  |  |  |
Threshold Percentage of Holding by Former Parent Company for Vesting of Performance Based Units |  |  |  | 10.00% |
Restricted Stock |  |  |  |  |
Equity-Based Compensation |  |  |  |  |
Issuance of restricted stock (in shares) | 5,941,693 |  |  |  |
Vested |  |  |  | 1,724,979 |
Class B Plan | Class B Units |  |  |  |  |
Equity-Based Compensation |  |  |  |  |
Number of units authorized (in units) |  | 6,366,891 |  | 6,366,891 |

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