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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 |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) ownership_class $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation | $ | $ 6,740 | $ 3,651 | $ 20,694 | $ 16,245 |
Performance Incentive Plan |  |  |  |  |
Accrued expenses | $ | 85,408 |  | $ 85,408 |  | $ 95,149
iPIP Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 6 years |  |
Performance Incentive Plan |  |  |  |  |
iPIP distributions to plan participants | $ |  |  | $ 7,400 |  |
iPIP distributions, cash component | $ |  |  | $ 3,800 |  |
iPIP distributions, equity component (in shares) |  |  | 389,545 |  |
iPIP distributions, equity component, fair value | $ |  |  | $ 3,600 |  |
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 |  |
Accrued expenses | $ | $ 44,200 |  | $ 44,200 |  | $ 37,500
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 | $ |  |  | $ 2,000 |  |
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) | 84.17 |  | 84.17 |  |
Granted (in shares) |  |  | 0 |  |
Forfeited (in shares) |  |  | (1.60) |  |
Points at end of period (in shares) |  |  | 85.77 |  |
2015-2016 Performance Incentive Plan |  |  |  |  |
Performance Incentive Plan |  |  |  |  |
Points at beginning of period (in shares) | 76.68 |  | 76.68 |  |
Granted (in shares) |  |  | 0 |  |
Forfeited (in shares) |  |  | (2.73) |  |
Points at end of period (in shares) |  |  | 79.41 |  |
2017-2018 Performance Incentive Plan |  |  |  |  |
Performance Incentive Plan |  |  |  |  |
Points at beginning of period (in shares) | 78.71 |  | 78.71 |  |
Granted (in shares) |  |  | 0 |  |
Forfeited (in shares) |  |  | (3.72) |  |
Points at end of period (in shares) |  |  | 82.43 |  |

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