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Significant Accounting Policies - Narrative (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business Organization And Significant Accounting Policies [Line Items]      
Cumulative-effect adjustment from the adoption of ASU 2015-02 (Note 2) $ 4,031,756 $ 0  
Number of business segment | Segment 1    
Allowance for doubtful accounts $ 0   $ 0
Accounts Receivable, Related Parties 9,100,000   9,200,000
Transfers between fair value levels $ 0   0
Client Performance Period 5 years    
Advance commissions amortization period 12 months    
Liability for Uncertain Tax Positions, Current $ 0   $ 0
Alternative Investments, Fair Value Disclosure 1,400,000    
Level 1 Inputs      
Business Organization And Significant Accounting Policies [Line Items]      
Value of Investment 95,736,885    
Mutual Funds | Money Market Funds | Level 1 Inputs      
Business Organization And Significant Accounting Policies [Line Items]      
Cash Equivalent Fair Value 41,000,000    
Incentive Fees Method One [Member]      
Business Organization And Significant Accounting Policies [Line Items]      
Performance Incentive Fees 0 0  
Investment Advisory Services [Member]      
Business Organization And Significant Accounting Policies [Line Items]      
Revenue from Related Parties 20,300,000 18,500,000  
Mutual fund administrative services [Member]      
Business Organization And Significant Accounting Policies [Line Items]      
Revenue from Related Parties $ 2,700,000 $ 3,100,000  
Class A [Member]      
Business Organization And Significant Accounting Policies [Line Items]      
Rate of Administrative Service Fees 0.24%   0.24%
Class C [Member]      
Business Organization And Significant Accounting Policies [Line Items]      
Rate of Administrative Service Fees 0.24%   0.24%
Class Y [Member]      
Business Organization And Significant Accounting Policies [Line Items]      
Rate of Administrative Service Fees 0.10%   0.10%