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Variable Interest Entities and Consolidated Investment Products (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 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 6,737   $ 23,878  
Less: redeemable noncontrolling interest 60,186   43,110  
Artisan’s direct equity investment in CIPs 51,200      
Variable Interest Entity, Not Primary Beneficiary        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Artisan’s direct equity investment in CIPs 2,500      
Variable Interest Entity, Primary Beneficiary        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 29,880   9,005 $ 3,739
Investments 151,993   106,736  
Investment liabilities, at fair value 13,843   6,186  
Net CIP assets included in the table above 144,685   105,555  
Net CIP assets/(liabilities) not included in the table above (33,268)   (28,509)  
Total Net CIP assets 111,417   77,046  
Artisan’s direct equity investment in CIPs 51,231   33,936  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Money Market Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 6,534   5,005  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 28,968   9,933  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 120,150   96,681  
Investment liabilities, at fair value 13,579   6,005  
Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 2,876   122  
Investment liabilities, at fair value 264   181  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Money Market Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 6,534   5,005  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 28,968   9,933  
Level 1 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | 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 | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 2,876   22  
Investment liabilities, at fair value 264   0  
Level 2 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | 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 | 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 | Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 120,150   96,681  
Investment liabilities, at fair value 13,579   6,005  
Level 2 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 0   100  
Investment liabilities, at fair value 0   181  
Level 3 | Fair Value, Measurements, Recurring | Variable Interest Entity, Primary Beneficiary | 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 | 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 | 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 | Derivative        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments 0   0  
Investment liabilities, at fair value $ 0   $ 0