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Variable Interest Entities and Consolidated Investment Products (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments in equity securities accounted for under the equity method $ 849 $ 16,335  
Net CIP assets included in the table above 222,471 105,555  
Net CIP assets not included in the table above (69,763) (28,509)  
Total Net CIP Assets 152,708 77,046  
Less: redeemable noncontrolling interests 93,753 43,110  
Artisan's direct equity investment in CIPs 58,955 33,936  
Less: Amounts reclassified to investment securities     $ 1,500
Investment securities $ 3,656 23,878  
Shares issued during period (in shares) 24,233    
Variable Interest Entity, Primary Beneficiary      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents $ 43,834 9,005  
Investment securities 230,380 106,736  
Investment-related Liabilities 15,731 6,186  
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 800    
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 7,822 5,005  
Recurring | Variable Interest Entity, Primary Beneficiary | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 83,960 9,933  
Recurring | Variable Interest Entity, Primary Beneficiary | Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 133,518 96,681  
Investment-related Liabilities 14,978 6,005  
Recurring | Variable Interest Entity, Primary Beneficiary | Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 12,902 122  
Investment-related Liabilities 753 181  
Fair Value, Inputs, Level 1 | 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 7,822 5,005  
Fair Value, Inputs, Level 1 | Recurring | Variable Interest Entity, Primary Beneficiary | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 83,027 9,933  
Fair Value, Inputs, Level 1 | Recurring | Variable Interest Entity, Primary Beneficiary | Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 0 0  
Investment-related Liabilities 0 0  
Fair Value, Inputs, Level 1 | Recurring | Variable Interest Entity, Primary Beneficiary | Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 12,902 22  
Investment-related Liabilities 566 0  
Fair Value, Inputs, Level 2 | 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  
Fair Value, Inputs, Level 2 | Recurring | Variable Interest Entity, Primary Beneficiary | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 933 0  
Fair Value, Inputs, Level 2 | Recurring | Variable Interest Entity, Primary Beneficiary | Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 133,518 96,681  
Investment-related Liabilities 14,978 6,005  
Fair Value, Inputs, Level 2 | Recurring | Variable Interest Entity, Primary Beneficiary | Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 0 100  
Investment-related Liabilities 187 181  
Fair Value, Inputs, Level 3 | 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  
Fair Value, Inputs, Level 3 | Recurring | Variable Interest Entity, Primary Beneficiary | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 0 0  
Fair Value, Inputs, Level 3 | Recurring | Variable Interest Entity, Primary Beneficiary | Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 0 0  
Investment-related Liabilities 0 0  
Fair Value, Inputs, Level 3 | Recurring | Variable Interest Entity, Primary Beneficiary | Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities 0 0  
Investment-related Liabilities $ 0 $ 0