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Income Taxes and Related Payments - Additional information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) TRA | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Approximate percentage of earnings not subject to income taxes | 20.00% |  |
Effective tax rate | 17.10% | 17.80% |
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 | $ 1,300 |  | $ 1,300
Deferred Tax Asset - Amortizable basis |  |  |
Deferred tax assets, beginning | 446,954 |  |
2021 Holdings Common Unit Exchanges | 2,228 |  |
Amortization | (9,661) |  |
Deferred tax assets, ending | 455,883 |  |
Amounts payable under tax receivable agreements |  |  |
Amounts payable under tax receivable, beginning agreements | 412,468 |  |
Establishment of amounts payable under tax receivable agreements | 15,802 | $ 30,853 |
Amounts payable under tax receivable, ending agreements | 428,270 |  |
Unrecognized tax benefits, income tax penalties accrued | 200 |  | 200
Unrecognized tax benefits | $ 1,300 |  | $ 1,300
Statutory tax rate | 21.00% |  |
Capital Unit |  |  |
Amounts payable under tax receivable agreements |  |  |
Establishment of amounts payable under tax receivable agreements | $ 1,894 |  |
LIBOR |  |  |
Tax receivable, basis point spread on variable rate (as a percent) | 100 |  |

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- Definition Deferred tax assets recorded as a result of the step-up of tax basis from the H&F Corp Merger and the purchase of Class A common units by APAM. + References No definition available. + Details
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