Noncontrolling interest - Holdings Share Issuances & Cancellations (Details)	9 Months Ended
Sep. 30, 2021 shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	0
Change in APAM economic ownership Interest in Artisan Partners Holdings LP (as a percent)	1.00%
Delivery of shares underlying RSUs (in shares)	1,074
Shares paid for tax withholding for share based compensation (in shares)	176,194
Forfeitures of Holdings GP Units from Employee Terminations (in shares)	(97,600)
Artisan Partners Holdings LP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending balance	83.00%
Follow On Offering
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	0
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	63,131,007
Holdings common unit exchanges (in shares)	(653,741)
Delivery of shares underlying RSUs (in shares)	1,074
Shares paid for tax withholding for share based compensation (in shares)	176,194
Forfeitures of Holdings GP Units from Employee Terminations (in shares)	(97,600)
Ending balance (in shares)	65,215,891
Class A Common Stock \| Follow On Offering
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	(963,614)
Limited Partnership Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	15,441,103
Holdings common unit exchanges (in shares)	(653,741)
Shares paid for tax withholding for share based compensation (in shares)	0
Forfeitures of Holdings GP Units from Employee Terminations (in shares)	0
Ending balance (in shares)	13,823,748
Limited Partnership Units \| Follow On Offering
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	(963,614)
Capital Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	78,572,110
Holdings common unit exchanges (in shares)	0
Change in APAM economic ownership Interest in Artisan Partners Holdings LP (as a percent)	0.00%
Holdings of common unit exchanges, APAM ownership percentage	1.00%
Shares paid for tax withholding for share based compensation (in shares)	176,194
Forfeitures of Holdings GP Units from Employee Terminations (in shares)	(97,600)
Ending balance (in shares)	79,039,639
Capital Units \| Artisan Partners Holdings LP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	80.00%
Ending balance	83.00%
Restricted Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	(740,249)
Restricted Stock \| Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	(740,249)
Restricted Stock \| Limited Partnership Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	0
Restricted Stock \| Capital Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	(740,249)
Change in APAM economic ownership Interest in Artisan Partners Holdings LP (as a percent)	1.00%
Restricted Stock Units RSUs
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Delivery of shares underlying RSUs (in shares)	1,074
Restricted Stock Units RSUs \| Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Delivery of shares underlying RSUs (in shares)	1,074
Restricted Stock Units RSUs \| Limited Partnership Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Delivery of shares underlying RSUs (in shares)	0
Restricted Stock Units RSUs \| Capital Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Holdings of common unit exchanges, APAM ownership percentage	0.00%
Capital Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in APAM economic ownership Interest in Artisan Partners Holdings LP (as a percent)	0.00%

Change in APAM Economic Ownership Interest in Artisan Partners Holdings LP (as a percent)

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Noncontrolling Interest, Increase (Decrease) Ownership Interest, Exchange of Units, Percent

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Number of capital units or capital shares outstanding. This element is relevant to issuers of face-amount certificates and registered investment companies.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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