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Related Parties - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 26, 2015
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]            
Fees receivable   $ 582,960   $ 582,960   $ 669,464
Payments under tax receivable agreement       20,961 $ 10,215  
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 basis increases 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   192,473   192,473   213,434
Payments under tax receivable agreement       $ 20,961    
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   $ 134,342 $ 186,446 $ 298,713 $ 360,124  
Type of Revenue [Extensible List]   Asset Management Fees [Member] Asset Management Fees [Member] Asset Management Fees [Member] Asset Management Fees [Member]  
Fees receivable   $ 110,061   $ 110,061   $ 96,740