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Investment Management Transfer Agent and Other Fees - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended
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Dec. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 Investor Class Shares | Dec. 31, 2013 Institutional Class Shares | Mar. 31, 2014 Offshore Funds | Mar. 31, 2013 Offshore Funds | Mar. 31, 2014 Offshore Funds | Mar. 31, 2013 Offshore Funds | Mar. 31, 2014 Offshore Funds Investment Advisory Services company | Nov. 30, 2013 Offshore Funds Investment Advisory Services fund | Mar. 31, 2014 Government Fund | Mar. 31, 2014 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% |  |  |  |  |  |  |  |  |  |  |
Percent minimum performance to designated benchmark over prior rolling 12 months |  | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in base advisory fees realized |  | $ (213,643) | $ 108,969 | $ (632,324) | $ (56,095) |  |  |  |  |  |  |  |  |  |
Aggregate fees waived and expenses borne |  | 354,118 | 798,138 | 2,102,329 | 2,502,737 |  |  |  |  |  |  |  |  |  |
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield |  | 0 | 298,128 | 583,577 | 885,273 |  |  |  |  |  |  |  |  |  |
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
Previous administrative fee rate |  |  |  |  |  | 0.08% | 0.06% |  |  |  |  |  |  |  |
Current annual administrative fee rate |  |  |  |  |  | 0.10% | 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 |  |  |  |  |  |  |  | $ 42,334 | $ 83,960 | $ 147,402 | $ 253,534 |  |  |  |

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