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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Total investments $ 787,139 $ 1,007,339
Equity method 15,915 16,250
Investments, at fair value 771,224 991,089
Securities sold, not yet purchased, at fair value (included in "other liabilities") 4,948 6,828
Debt [Member]    
Schedule of Investments [Line Items]    
Total investments 99,988 299,990
Investments, at fair value 99,988 299,990
Equities [Member]    
Schedule of Investments [Line Items]    
Total investments 45,704 54,040
Investments, at fair value 45,704 54,040
Alternative Investment Funds [Member]    
Schedule of Investments [Line Items]    
Total investments 54,003 49,757
Investments, at fair value 54,003 49,757
Debt Funds [Member]    
Schedule of Investments [Line Items]    
Total investments 181,322 164,952
Investments, at fair value 181,322 164,952
Equity Funds [Member]    
Schedule of Investments [Line Items]    
Total investments 352,544 375,761
Investments, at fair value 352,544 375,761
Private Equity Funds [Member]    
Schedule of Investments [Line Items]    
Total investments 37,663 46,589
Investments, at fair value 37,663 46,589
Funds Total [Member]    
Schedule of Investments [Line Items]    
Total investments 625,532 637,059
Equity Method [Member]    
Schedule of Investments [Line Items]    
Total investments $ 15,915 $ 16,250