XML 99 R77.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 07, 2024 | Jan. 30, 2024 | Jan. 08, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 01, 2024
Subsequent Event [Line Items] |  |  |  |  |  |  |
Deferred Tax Assets, Exchanges |  |  |  | $ 1,789 | $ 8,687 |  |
Establishment of amounts payable under tax receivable agreements |  |  |  | $ 1,016 | $ 6,471 | $ 44,209 |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Declared |  | $ 30,200 |  |  |  |  |
Deferred Tax Assets, Exchanges | $ 7,600 |  | $ 7,600 |  |  |  |
Establishment of amounts payable under tax receivable agreements | $ 6,400 |  | $ 6,400 |  |  |  |
Conversion of Stock, Shares Converted | 215,424 |  | 350,000 |  |  |  |
Subsequent Event | Long Term Incentive |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Long-Term Incentive Awards, Costs Not Yet Recognized |  |  |  |  |  |  | $ 59,200
Subsequent Event | Cash Award |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Long-Term Cash Awards, Costs Not Yet Recognized [Line Items] |  |  |  |  |  |  | 38,400
Subsequent Event | Unvested restricted share-based awards |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Long-Term Incentive Awards, Costs Not Yet Recognized |  |  |  |  |  |  | $ 20,800
Subsequent Event | Class A Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  | $ 1.02 |  |  |  |  |
Subsequent Event | Quarterly cash dividend | Class A Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  | 0.68 |  |  |  |  |
Subsequent Event | Special annual dividend | Class A Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  | $ 0.34 |  |  |  |  |

X
- 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 Long-Term Cash Awards, Grant Date Fair Value + References No definition available. + Details
Name: | apam_LongTermCashAwardsGrantDateFairValue
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-Term Incentive Awards, Grant Date Fair Value + References No definition available. + Details
Name: | apam_LongTermIncentiveAwardsGrantDateFairValue
Namespace Prefix: | apam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
Name: | us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_DistributionMadeToLimitedPartnerCashDistributionsDeclared
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=apam_LongTermIncentiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=apam_CashAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=apam_QuarterlyCashDividendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=apam_SpecialAnnualDividendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |