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Income Taxes and Related Payments - Additional information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Approximate percentage of earnings not subject to income taxes | 31.00% | 33.00% | 38.00%
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Existing Income Tax Expense |  |  | $ 352,000
Tax Receivable Agreement Percentage Savings Required 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 that Would Impact Effective Tax Rate | $ 1,600 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | $ 300 |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |
Tax Receivable, Basis Point Spread on Variable Rate, Basis Points | 100 |  |

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- Definition Represents the expected payment date for payments made under the TRA, which is defined as the number of days from the date APAM's federal income tax return is filed for each fiscal year. + References No definition available. + Details
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- Definition Portion of the applicable cash savings, if any, in U.S. federal and state income tax that APAM actually realizes (or is deemed to realize in certain circumstances) to be paid to the holders of convertible preferred stock issued as consideration for the H&F Corp Merger (or Class A common stock issued upon conversion of that convertible preferred stock). + References No definition available. + Details
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- Definition Portion of the applicable cash savings, if any, in U.S. federal and state income tax that APAM actually realizes (or is deemed to realize in certain circumstances) retained by the entity. + References No definition available. + Details
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- Definition Amount of income tax expense for which accounting for tax effect for remeasurement of deferred tax asset from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act and no reasonable estimate is determined. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(c)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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