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Related Party Transactions - Summary of Deposits and Withdrawals Made by Related Parties (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Apr. 01, 2016
Related Party Transaction [Line Items]      
Other assets [1] $ 106,870 $ 156,278  
Related Party Fund | Affiliated Entity      
Related Party Transaction [Line Items]      
Expense 1,100    
Related Party Fund | Investor fees - Funds and SMAs | Affiliated Entity      
Related Party Transaction [Line Items]      
Income $ 67    
Related Party Fund      
Related Party Transaction [Line Items]      
Equity method investment     $ 10,000
Ownership 25.00%    
Board Member | Related Party Fund      
Related Party Transaction [Line Items]      
Ownership 0.00%    
Related Party Fund      
Related Party Transaction [Line Items]      
Loans $ 0    
Other investment fund      
Related Party Transaction [Line Items]      
Other assets 8,900    
Distribution Receivable due from Other Investments      
Related Party Transaction [Line Items]      
Other assets $ 1,250    
[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.