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Income Taxes and Related Payments - Components of deferred tax assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Deferred tax assets:
Amortizable basis	$ 434,213		$ 408,140
Other	31,435		27,757
Total deferred tax assets	465,648		435,897
Less: valuation allowance	0		0
Deferred tax assets	465,648		$ 435,897
Deferred Tax Assets, Exchanges	22,235
Non cash Transaction Initial Establishment of Amounts Payable Under Tax Receivable Agreements	37,110	$ 8,894
Follow On Offering
Deferred Tax Assets, Exchanges	21,424
Non cash Transaction Initial Establishment of Amounts Payable Under Tax Receivable Agreements	$ 18,211

X

- Definition

Deferred Tax Assets, Exchanges

+ References

No definition available.

+ Details

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Namespace Prefix:	apam_
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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

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Namespace Prefix:	apam_
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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

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Namespace Prefix:	apam_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319

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Balance Type:	debit
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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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