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Summary of Significant Accounting Policies Other Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Variable Interest Entity Consolidation Threshold 10.00%   10.00%    
Operating lease assets $ 91,458   $ 91,458   $ 0
Other investment gain (loss) 1,383 $ 660 3,340 $ 1,114  
Investment Income, Nonoperating 1,108 $ 304 2,723 $ 625  
Total operating lease liabilities $ 105,429   $ 105,429   $ 0
Artisan Global Funds          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Number of Consolidated Variable Interest Entities 3   3    
Artisan Private Funds          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Number of Consolidated Variable Interest Entities 1   1