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v3.25.2

Income Taxes and Related Payments - Changes in Deferred Tax Assets (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Deferred Tax Asset - Amortizable Basis |  |
Deferred tax assets, beginning | $ 354,773 |
2025 Holdings Common Unit Exchanges | 619 |
Amortization | (23,860) |
Deferred tax assets, ending | 331,532 |
Amounts Payable Under TRAs |  |
Amounts payable under tax receivable, beginning agreements | 341,461 |
Establishment of amounts payable under tax receivable agreements | 526 | $ 11,551
Payments under the tax receivable agreements | (29,197) | $ (27,898)
Amounts payable under tax receivable, ending agreements | 312,791 |
Capital Unit |  |
Amounts Payable Under TRAs |  |
Establishment of amounts payable under tax receivable agreements | $ 527 |

X
- Definition Amortization of deferred tax asset related to tax receivable agreements. + References No definition available. + Details
Name: | apam_AmortizationofTRADTA
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amounts payable under tax receivable agreement. + References No definition available. + Details
Name: | apam_AmountsPayableUnderTaxReceivableAgreement
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Asset [Roll Forward] + References No definition available. + Details
Name: | apam_DeferredTaxAssetRollForward
Namespace Prefix: | apam_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred Tax Assets, Exchanges + References No definition available. + Details
Name: | apam_DeferredTaxAssetsExchanges
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | apam_DeferredTaxAssetsStepUpOfTaxBasis
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Initial establishment of the estimated liability associated with the tax benefits expected to be realized as a result of the tax receivable agreements. + References No definition available. + Details
Name: | apam_NonCashTransactionInitialEstablishmentOfAmountsPayableUnderTaxReceivableAgreements
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Receivable Agreement Payments + References No definition available. + Details
Name: | apam_TaxReceivableAgreementPayments
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Receivable Agreements [Roll Forward] + References No definition available. + Details
Name: | apam_TaxReceivableAgreementsRollForward
Namespace Prefix: | apam_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | apam_HoldingsCommonUnitExchangesAxis=apam_CapitalUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |