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Investment Management Transfer Agent and Other Fees - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended |  |  | 6 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Offshore funds | Dec. 31, 2012 Offshore funds | Dec. 31, 2013 Offshore funds | Dec. 31, 2012 Offshore funds | Dec. 31, 2013 Investor Class Shares Minimum | Dec. 31, 2013 Investor Class Shares Maximum | Dec. 31, 2013 Institutional Class Shares Minimum | Dec. 31, 2013 Institutional Class Shares Maximum | Dec. 31, 2013 Offshore Funds Investment Advisory Services company | Nov. 30, 2013 Offshore Funds Investment Advisory Services fund | Dec. 31, 2013 Government Fund | Dec. 31, 2013 U.S. Treasury Securities Cash Fund
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base percentage adjustment when fund performance is not within limits to benchmark index | 0.25% | 0.25% |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Percent minimum performance to designated benchmark over prior rolling 12 months | 5.00% | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in base advisory fees realized |  | $ (286,070) | $ 181,850 | $ (418,681) | $ (165,064) |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 4/30/2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fees waived and expenses borne |  | 892,841 | 854,558 | 1,748,211 | 1,704,599 |  |  |  |  |  |  |  |  |  |  |  |
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield |  | 248,813 | 286,600 | 583,577 | 587,235 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (498,342) |
Minimum yield waivers subject to future recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Annual administrative fee rate |  |  |  |  |  |  |  |  |  | 0.08% | 0.10% | 0.06% | 0.08% |  |  |  |
Administrative services fees on average daily net assets | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offshore clients company provides advisory services for |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of funds liquidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Recorded advisory and performance fees |  |  |  |  |  | $ 52,790 | $ 79,012 | $ 105,068 | $ 169,574 |  |  |  |  |  |  |  |

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