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Significant Accounting Policies - Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating Expenses:        
Total operating expenses $ 61,449 $ 52,090 $ 122,128 $ 104,739
Previously Reported [Member]        
Operating Revenues:        
Total revenues   77,603   150,433
Operating Expenses:        
Total operating expenses   53,918   108,141
Previously Reported [Member] | Advisory Fees [Member]        
Operating Revenues:        
Total revenues   75,997   147,613
Previously Reported [Member] | Fund Management And Administration [Member]        
Operating Expenses:        
Total operating expenses   16,195   31,716
Adjustment [Member]        
Operating Revenues:        
Amounts collected on behalf of third parties   (1,828)   (3,402)
Operating Expenses:        
Amounts collected on behalf of third parties   (1,828)   (3,402)
Adjustment [Member] | Advisory Fees [Member]        
Operating Revenues:        
Amounts collected on behalf of third parties   (1,828)   (3,402)
Operating Expenses:        
Amounts collected on behalf of third parties   (1,828)   (3,402)
As Corrected [Member]        
Operating Revenues:        
Total revenues   75,775   147,031
Operating Expenses:        
Total operating expenses   52,090   104,739
As Corrected [Member] | Advisory Fees [Member]        
Operating Revenues:        
Total revenues   74,169   144,211
As Corrected [Member] | Fund Management And Administration [Member]        
Operating Expenses:        
Total operating expenses   $ 14,367   $ 28,314