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%