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Significant Accounting Policies - Narrative (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Segment
Dec. 31, 2013
Business Organization And Significant Accounting Policies [Line Items]      
Number of business 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 441,411 1,238,765  
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 0.25% 0.25%  
Class Y
      
Business Organization And Significant Accounting Policies [Line Items]      
Rate of Administrative Service Fees 0.10% 0.10%  
Mutual Funds | Money Market Funds | Level 1 Inputs
      
Business Organization And Significant Accounting Policies [Line Items]      
Cash Equivalent Fair Value $ 38,800,000 $ 38,800,000 $ 16,800,000