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Stock-Based Compensation Plans and Employee Benefits - Performance Incentive Plans (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) ownership_class $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation | $ | $ 5,661 | $ 6,740 | $ 26,675 | $ 20,694 |
Performance Incentive Plan |  |  |  |  |
Accrued expenses | $ | 84,742 |  | $ 84,742 |  | $ 83,778
iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 6 years |  |
Performance Incentive Plan |  |  |  |  |
Accrued expenses | $ | $ 58,600 |  | $ 58,600 |  | $ 41,900
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 (as a percent) |  |  | 100.00% |  |
Equity-based compensation | $ |  |  | $ 2,500 | 2,000 |
Settlement or distribution on units and awards, cash (as a percent) |  |  | 50.00% |  |
Settlement or distribution on units and awards, common stock (as a percent) |  |  | 50.00% |  |
2013-2018 Performance Incentive Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation | $ |  |  | $ 20,200 | 14,100 |
Settlement or distribution on units and awards, cash (as a percent) |  |  | 50.00% |  |
Settlement or distribution on units and awards, common stock (as a percent) |  |  | 50.00% |  |
2013-2014 Performance Incentive Plan |  |  |  |  |
Performance Incentive Plan |  |  |  |  |
Points at beginning of period (in shares) | 80.17 |  | 80.17 |  |
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) | 70.40 |  | 70.40 |  |
Forfeited (in shares) |  |  | (2.88) |  |
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) | 73.34 |  | 73.34 |  |
Forfeited (in shares) |  |  | (3.93) |  |
Points at end of period (in shares) |  |  | 77.27 |  |
Vesting at end of second year | iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  |  | 40.00% |  |
Vesting at end of third year | iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  |  | 15.00% |  |
Vesting at end of fourth year | iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  |  | 15.00% |  |
Vesting at end of fifth year | iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  |  | 15.00% |  |
Vesting at end of sixth year | iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  |  | 15.00% |  |

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