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Investment Management Transfer Agent and Other Fees - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Funds
Sep. 30, 2012
Investment Management And Other Fees [Line Items]      
Transfer agency business exit, Agreement date 2013-08-23 2013-08-23  
Base advisory fee adjustment, description Is adjusted upwards or downwards by 0.25 percent when there is a performance difference of 5 percent or more between a fund's performance and that of its designated benchmark index over the prior rolling 12 months.    
Decrease in base advisory fees realized   $ (132,611) $ (346,914)
Aggregate fees waived and expenses borne   855,370 850,042
Date through which the company agreed to contractually limit the expenses of the two fixed income funds and the institutional class of Global Resources Fund   2014-04-30  
Number of fixed income funds   2  
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield   334,764 300,635
Minimum yield waivers recoverable through 12/31/13   678,107  
Minimum yield waivers recoverable through 12/31/14   736,531  
Minimum yield waivers recoverable through 12/31/15   509,874  
Minimum yield waivers recoverable through 12/31/16   395,409  
Offshore Fund [Member]
     
Investment Management And Other Fees [Line Items]      
Recorded advisory and performance fees   $ 52,278 $ 90,562