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Investments - Summary of Financial Information for Company's Equity Method Investments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statements of operations:      
Total revenues $ 77,211 $ 85,619 $ 87,790
Total expenses 61,680 72,906 73,327
Net income 15,531 12,713 $ 14,463
Statements of financial condition:      
Total assets 90,516 102,019  
Total partners’ capital 42,229 39,161  
Total liabilities and partners’ capital 90,516 102,019  
Cash and Cash Equivalents [Member]      
Statements of financial condition:      
Total assets 64,614 74,069  
Fixed Assets, Net [Member]      
Statements of financial condition:      
Total assets 3,120 3,420  
Other Assets [Member]      
Statements of financial condition:      
Total assets 22,782 24,530  
Payables to Related Parties [Member]      
Statements of financial condition:      
Total liabilities 2,000 2,000  
Other Liabilities [Member]      
Statements of financial condition:      
Total liabilities $ 46,287 $ 60,858