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Income Taxes and Related Payments - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Approximate percentage of earnings not subject to income taxes	16.00%	17.00%	19.00%
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	$ 200	$ 100
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 100

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	apam_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	apam_TaxReceivableAgreementPaymentPeriod
Namespace Prefix:	apam_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	apam_TaxReceivableAgreementPercentageSavingsRequiredToBePaidToShareholders
Namespace Prefix:	apam_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	apam_TaxReceivableAgreementPercentageToBeRetainedByEntity
Namespace Prefix:	apam_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant