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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
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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 |  |  |  |

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- Definition Investment Advisory Fees, Fee Adjustment, Base Percentage Adjustment When Fund Performance Is Not Within Limits to Benchmark Index + References No definition available. + Details
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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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