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Related Parties - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 26, 2015
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]        
Fees receivable   $ 509,831   $ 491,861
Benefit pursuant to tax receivable agreement   40,435    
Payments for tax receivable agreement obligation   32,191 $ 20,945  
Sponsored Funds [Member]        
Related Party Transaction [Line Items]        
Revenue   $ 133,523 $ 164,371  
Type of Revenue [Extensible List]   Asset Management Fees [Member] Asset Management Fees [Member]  
Fees receivable   $ 58,596   57,283
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%      
Tax receivable agreement date Oct. 26, 2015      
Cumulative liability relating to obligations under Amended and Restated Tax Receivable Agreement   118,563   $ 191,189
Benefit pursuant to tax receivable agreement   40,435    
Payments for tax receivable agreement obligation   $ 32,191    
Amended and Restated Tax Receivable Agreement [Member]        
Related Party Transaction [Line Items]        
Tax agreement termination year   2033