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Income Taxes and Related Payments - Additional information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) TRA | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Approximate percentage of earnings not subject to income taxes |  |  | 31.00% |  |
Effective tax rate |  |  | 7.30% | 15.70% |
Number of tax receivable agreements (TRAs) | TRA |  |  | 2 |  |
TRA percent of savings to be paid to shareholders |  |  | 85.00% |  |
Tax receivable agreement percentage to be retained by entity |  |  | 15.00% |  |
Tax receivable agreement payment period |  |  | 125 days |  |
Unrecognized tax benefits | $ 2,000 |  | $ 2,000 |  | $ 0
Deferred Tax Asset - Amortizable basis |  |  |  |  |
Deferred tax assets, beginning |  |  | 404,715 |  |
2019 Holdings Common Unit Exchanges |  |  | 11,542 |  |
Amortization |  |  | (23,856) |  |
Change in estimate |  |  | 21,873 |  |
Deferred tax assets, ending | 414,274 |  | 414,274 |  |
Amounts payable under tax receivable agreements |  |  |  |  |
Amounts payable under tax receivable, beginning agreements |  |  | 369,355 |  |
2019 Holdings Common Unit Exchanges |  |  | 29,368 | $ 19,683 |
Payments under TRA |  |  | (24,998) | (36,111) |
Change in estimate | 19,557 | $ (251) | 19,557 | $ (251) |
Amounts payable under tax receivable, ending agreements | 373,725 |  | 373,725 |  |
Unrecognized tax benefits that would impact effective tax rate | 1,600 |  | 1,600 |  |
Unrecognized tax benefits, income tax penalties accrued | 300 |  | 300 |  |
Unrecognized tax benefits | $ 2,000 |  | $ 2,000 |  | $ 0
Statutory tax rate |  |  | 21.00% |  |
Capital Unit |  |  |  |  |
Amounts payable under tax receivable agreements |  |  |  |  |
2019 Holdings Common Unit Exchanges |  |  | $ 9,811 |  |
LIBOR |  |  |  |  |
Tax receivable, basis point spread on variable rate (as a percent) |  |  | 100 |  |

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