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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Expenses:      
Total operating expenses $ 215,260 $ 194,830 $ 212,994
Previously Reported [Member]      
Operating Revenues:      
Total revenues   253,699 268,403
Operating Expenses:      
Total operating expenses   198,617 214,869
Previously Reported [Member] | Advisory Fees [Member]      
Operating Revenues:      
Total revenues   250,182 265,652
Previously Reported [Member] | Fund Management And Administration [Member]      
Operating Expenses:      
Total operating expenses   60,515 61,502
Adjustment [Member]      
Operating Revenues:      
Amounts collected on behalf of third parties   (3,787) (1,875)
Operating Expenses:      
Amounts collected on behalf of third parties   (3,787) (1,875)
Adjustment [Member] | Advisory Fees [Member]      
Operating Revenues:      
Amounts collected on behalf of third parties   (3,787) (1,875)
Operating Expenses:      
Amounts collected on behalf of third parties   (3,787) (1,875)
As Corrected [Member]      
Operating Revenues:      
Total revenues   249,912 266,528
Operating Expenses:      
Total operating expenses   194,830 212,994
As Corrected [Member] | Advisory Fees [Member]      
Operating Revenues:      
Total revenues   246,395 263,777
As Corrected [Member] | Fund Management And Administration [Member]      
Operating Expenses:      
Total operating expenses   $ 56,728 $ 59,627