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Income Taxes and Related Payments - Additional information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($) TRA	Sep. 30, 2024	Dec. 31, 2024 USD ($)
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%
Approximate percentage of earnings not subject to income taxes	14.00%
Effective tax rate	24.00%	19.90%
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	$ 2,200		$ 1,800
Unrecognized tax benefits, income tax penalties accrued	$ 300		$ 200
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	3.10%
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	$ 10,700

X

- Definition

Represents the percentage of earnings attributable to noncontrolling interests and therefore not subject to income taxes.

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Deferred Tax Assets, Increase (Decrease)

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- Definition

Income Tax Disclosure, Number of Tax Receivable Agreements

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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.

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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).

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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.

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No definition available.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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- Definition

Percentage of reported income tax benefit (expense) from difference to income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to other reconciling items. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law.

+ References

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- Definition

Amount of unrecognized tax benefits.

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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.

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