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Significant Accounting Policies - Summary of Reclassifications of Consolidated Statements of Operations and Consolidated Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating Revenues:        
Total revenues $ 78,112 $ 63,749 $ 225,143 $ 184,260
Operating Expenses:        
Fund management and administration 15,181 14,328 43,495 41,785
Total operating expenses 53,909 49,005 158,648 142,085
Advisory Fees [Member]        
Operating Revenues:        
Total revenues $ 76,400 63,028 $ 220,611 181,697
Fund Management And Administration [Member]        
Operating Expenses:        
Fund management and administration   14,328   41,785
Previously Reported [Member]        
Operating Revenues:        
Total revenues   64,640   186,640
Operating Expenses:        
Total operating expenses   49,896   144,465
Previously Reported [Member] | Advisory Fees [Member]        
Operating Revenues:        
Total revenues   63,919   184,077
Previously Reported [Member] | Fund Management And Administration [Member]        
Operating Expenses:        
Fund management and administration   15,219   44,165
Adjustment [Member]        
Operating Revenues:        
Amounts collected on behalf of third parties   (891)   (2,380)
Operating Expenses:        
Amounts collected on behalf of third parties   (891)   (2,380)
Adjustment [Member] | Advisory Fees [Member]        
Operating Revenues:        
Amounts collected on behalf of third parties   (891)   (2,380)
Adjustment [Member] | Fund Management And Administration [Member]        
Operating Expenses:        
Amounts collected on behalf of third parties   $ (891)   $ (2,380)