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Related Parties - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 26, 2015
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]            
Fees receivable   $ 547,087   $ 547,087   $ 621,880
Payments under tax receivable agreement       10,215 $ 25,454  
LTBP Trust [Member]            
Related Party Transaction [Line Items]            
Amount of cash savings in income or franchise tax that would be realized as a result of increases in tax basis and certain other tax benefits related to the amended and restated tax receivable agreement 45.00%          
Cash tax saving that may arise from tax benefits attributable to payments under the amended and restated tax receivable agreement 85.00%          
Cumulative liability relating to obligations under Amended and Restated Tax Receivable Agreement   211,236   211,236   221,451
Payments under tax receivable agreement       $ 10,215    
Amended and Restated Tax Receivable Agreement [Member]            
Related Party Transaction [Line Items]            
Tax agreement termination year       2033    
Sponsored Funds [Member]            
Related Party Transaction [Line Items]            
Revenue   $ 164,340 $ 131,885 $ 524,464 $ 386,413  
Type of Revenue [Extensible List]   Asset Management Fees [Member] Asset Management Fees [Member] Asset Management Fees [Member] Asset Management Fees [Member]  
Fees receivable   $ 57,375   $ 57,375   $ 72,076