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Related Party Transactions - Summary of Deposits and Withdrawals Made by Related Parties (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Other assets [1] $ 113,896 $ 156,278
Related Party Fund | Affiliated Entity    
Related Party Transaction [Line Items]    
Expense 2,500  
Related Party Fund | Investor fees - Funds and SMAs | Affiliated Entity    
Related Party Transaction [Line Items]    
Income 200  
Related Party Fund    
Related Party Transaction [Line Items]    
Loans $ 6,300  
Other investment fund    
Related Party Transaction [Line Items]    
Ownership (percent) 24.00%  
Other assets $ 8,500  
[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.