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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

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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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