Noncontrolling interest - Holdings Share Issuances & Cancellations (Details) - shares	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common Stock, Shares, Outstanding	77,814,721	76,942,872
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted share award net share settlement (in shares)	(74,006)
Ending balance	72.00%
Class A Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Outstanding	56,145,554	54,071,188
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted share award net share settlement (in shares)	(74,006)
Holdings GP Units
Class of Stock [Line Items]
Common Stock, Shares, Outstanding		54,071,188
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending balance (in shares)	56,145,554
Limited Partnership Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	22,871,684
Holdings common unit exchanges (in shares)	(1,202,517)
Restricted share award net share settlement (in shares)	0
Forfeitures of Holdings GP Units from Employee Terminations (in shares)	0
Ending balance (in shares)	21,669,167
Capital Units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	76,942,872
Beginning balance	70.00%
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%
Restricted share award net share settlement (in shares)	(74,006)
Forfeitures of Holdings GP Units from Employee Terminations (in shares)	(13,145)
Ending balance	72.00%
Ending balance (in shares)	77,814,721
Restricted Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	959,000
Restricted Stock \| Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	959,000
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)	959,000
Change in APAM economic ownership Interest in Artisan Partners Holdings LP (as a percent)	1.00%
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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No definition available.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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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 new stock issued during the period.

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Number of shares that have been repurchased and retired during the period.

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The number of units or equivalent units outstanding for all classes.

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