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Investment Management and Other Fees - Additional Information (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Investment [Line Items] |  |  |  |
Base percentage adjustment, fund performance not within benchmark index |  | 0.25% |  |
Minimum performance to designated benchmark over prior rolling twelve months, percent |  | 5.00% |  |
Increase (decrease) in base advisory fees realized |  | $ (815,000) | $ (133,000) | $ (2,200,000)
Aggregate fees waived and expenses borne |  | 2,400,000 | 3,300,000 | 3,100,000
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield |  | 583,000 |  |
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 |  |
Administrative services fee, per fund | 10,000 |  |  |
Advisory fees |  | 7,760,000 | 12,189,000 | 14,933,000
Investor Class Shares [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Previous administrative fee rate | 0.08% |  |  |
Administrative fee rate | 0.10% |  |  |
Institutional Class Shares [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Previous administrative fee rate | 0.06% |  |  |
Administrative fee rate | 0.08% |  |  |
Offshore clients |  |  |  |
Investment [Line Items] |  |  |  |
Advisory fees |  | 190,000 | 299,000 | 352,000
Performance fees |  | $ 4,000 | $ 19,000 | $ 6,000
Investment Advisory Services [Member] | Offshore fund [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Number of Customers |  | 3 |  |
Maximum [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Shareholder services fee, percentage of share value in account |  | 0.20% |  |

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- Definition Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield. + References No definition available. + Details
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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 Investment Advisory Fees, Fee Adjustment, Percent Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months + 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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