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Significant Accounting Policies - Narrative (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Segment
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Business Organization And Significant Accounting Policies [Line Items]          
Number of business segment | Segment     1    
Allowance for doubtful accounts $ 0   $ 0   $ 0
Transfers between fair value levels 0   $ 0   0
Client Performance Period     5 years    
Advance commissions amortization period     12 months    
Contractual Expense Reimburse, Net 666,749 $ 401,313 $ 1,214,504 $ 797,354  
Liability for Uncertain Tax Positions, Current $ 0   $ 0   $ 0
Class A, C, and I Shares          
Business Organization And Significant Accounting Policies [Line Items]          
Rate of Administrative Service Fees 0.24%   0.24%   0.25%
Class Y          
Business Organization And Significant Accounting Policies [Line Items]          
Rate of Administrative Service Fees 0.10%   0.10%   0.10%
Mutual Funds | Money Market Funds | Level 1 Inputs          
Business Organization And Significant Accounting Policies [Line Items]          
Cash Equivalent Fair Value $ 38,600,000   $ 38,600,000   $ 31,800,000
Incentive Fees Method One [Member]          
Business Organization And Significant Accounting Policies [Line Items]          
Performance Incentive Fees     $ 0 $ 0