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INVESTMENT MANAGEMENT, TRANSFER AGENT AND OTHER FEES - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Investor Class Shares
Dec. 31, 2013
Institutional Class Shares
Sep. 30, 2014
Offshore Funds
Sep. 30, 2013
Offshore Funds
Sep. 30, 2014
Offshore Funds
Investment Advisory Services
company
Sep. 30, 2014
Government Fund
Nov. 01, 2014
Forecast
Oct. 31, 2014
Forecast
Investment Management And Other Fees [Line Items]                      
Base percentage adjustment when fund performance is not within limits to benchmark index   0.25%                  
Percent minimum performance to designated benchmark over prior rolling 12 months   5.00%                  
Increase (decrease) in base advisory fees realized   $ (183,000) $ (133,000)                
Aggregate fees waived and expenses borne   277,000 855,000                
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield     335,000                
Minimum yield waivers recoverable through 12/31/14                 737,000    
Minimum yield waivers recoverable through 12/31/15                 510,000    
Minimum yield waivers recoverable through 12/31/16                 498,000    
Previous administrative fee rate       0.08% 0.06%            
Current annual administrative fee rate       0.10% 0.08%            
Administrative services fees per fund 10,000                 7,000 10,000
Number of offshore clients company provides advisory services for               2      
Recorded advisory and performance fees   $ 2,420,000 $ 2,089,000     $ 47,000 $ 52,000