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Stock-Based Compensation Plans and Employee Benefits - Performance Incentive Plans (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
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Mar. 31, 2020 USD ($) ownership_class $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity-based compensation | $ | $ 16,270 | $ 4,249 |
Performance Incentive Plan |  |  |
Accrued expenses | $ | $ 76,283 |  | $ 83,778
iPIP Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 6 years |  |
Performance Incentive Plan |  |  |
Accrued expenses | $ | $ 54,700 |  | $ 41,900
iPIP Plans | Vesting at end of second year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting rights percentage | 40.00% |  |
iPIP Plans | Vesting in each of years three through six |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting rights percentage | 15.00% |  |
2019-2020 Performance Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of ownership classes of consolidated subsidiary | ownership_class | 2 |  |
Ownership percentage of class A units (percent) | 100.00% |  |
Equity-based compensation | $ | $ 700 | 400 |
Settlement or distribution on units and awards, cash (percent) | 50.00% |  |
Settlement or distribution on units and awards, common stock (percent) | 50.00% |  |
2013-2018 Performance Incentive Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Settlement or distribution on units and awards, cash (percent) | 50.00% |  |
Settlement or distribution on units and awards, common stock (percent) | 50.00% |  |
2013-2014 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 80.17 |  |
Granted (in shares) | 0 |  |
Forfeited (in shares) | (1.00) |  |
Points at end of period (in shares) | 81.17 |  |
iPIP distributions to plan participants | $ |  | $ 7,400 |
iPIP distributions, equity component (in shares) |  | 389,545 |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares |  | $ 9.21 |
iPIP distributions, shares issued net of tax withholdings (in shares) |  | 209,118 |
2015-2016 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 72.15 |  |
Granted (in shares) | 0 |  |
Forfeited (in shares) | (1.13) |  |
Points at end of period (in shares) | 73.28 |  |
iPIP distributions to plan participants | $ | $ 1,500 |  |
iPIP distributions, equity component (in shares) | 54,245 |  |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares | $ 14.51 |  |
iPIP distributions, shares issued net of tax withholdings (in shares) | 32,825 |  |
2017-2018 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 76.34 |  |
Granted (in shares) | 0 |  |
Forfeited (in shares) | (0.93) |  |
Points at end of period (in shares) | 77.27 |  |

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