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Significant Accounting Policies - Narrative (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Segment
Jun. 30, 2015
USD ($)
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   $ 0
Accounts Receivable, Related Parties 9,200,000   9,200,000   9,200,000
Transfers between fair value levels 0   $ 0   0
Client Performance Period     5 years    
Advance commissions amortization period     12 months    
Liability for Uncertain Tax Positions, Current 0   $ 0   $ 0
Alternative Investments, Fair Value Disclosure 1,400,000   1,400,000    
Level 1 Inputs          
Business Organization And Significant Accounting Policies [Line Items]          
Value of Investment 102,624,785   102,624,785    
Mutual Funds | Money Market Funds | Level 1 Inputs          
Business Organization And Significant Accounting Policies [Line Items]          
Cash Equivalent Fair Value 46,000,000   46,000,000    
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 22,000,000 $ 20,000,000 42,300,000 38,500,000  
Mutual fund administrative services [Member]          
Business Organization And Significant Accounting Policies [Line Items]          
Revenue from Related Parties $ 3,000,000 $ 3,500,000 $ 5,800,000 $ 6,600,000  
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%