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Variable Interest Entities and Consolidated Investment Products (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deconsolidation, Gain (Loss), Amount $ 0      
Amounts reclassified to investment securities upon deconsolidation   $ 1,500    
Investments 5,297   $ 23,878  
Less: redeemable noncontrolling interest 46,027   43,110  
Artisan’s direct equity investment in CIPs 33,100      
Variable Interest Entity, Not Primary Beneficiary [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Artisan’s direct equity investment in CIPs 1,700      
Variable Interest Entity, Primary Beneficiary [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 4,800   9,005 $ 6,096
Investments 107,396   106,736  
Investment liabilities, at fair value 12,676   6,186  
Net CIP assets included in the table above 99,420   105,555  
Net CIP assets/(liabilities) not included in the table above (20,311)   (28,509)  
Total Net CIP assets 79,109   77,046  
Artisan’s direct equity investment in CIPs 33,082   33,936  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Money Market Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 4,700   5,005  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 6,211   9,933  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 101,185   96,681  
Investment liabilities, at fair value 12,662   6,005  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments     122  
Investment liabilities, at fair value 14   181  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Money Market Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 4,700   5,005  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 6,211   9,933  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 0   0  
Investment liabilities, at fair value 0   0  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments     22  
Investment liabilities, at fair value 14   0  
Level 2 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Money Market Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0   0  
Level 2 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 0   0  
Level 2 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 101,185   96,681  
Investment liabilities, at fair value 12,662   6,005  
Level 2 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments     100  
Investment liabilities, at fair value 0   181  
Level 3 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Money Market Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 0   0  
Level 3 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 0   0  
Level 3 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 0   0  
Investment liabilities, at fair value 0   0  
Level 3 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary [Member] | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments     0  
Investment liabilities, at fair value $ 0   $ 0