INVESTMENT MANAGEMENT, TRANSFER AGENT AND OTHER FEES - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 01, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Investment Management And Other Fees [Line Items]
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			$ (247,000)	$ (286,000)	$ (430,000)	$ (419,000)
Aggregate fees waived and expenses borne			337,000	893,000	614,000	1,748,000
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield				249,000		584,000
Administrative services fees per fund	7,000	10,000
Recorded advisory and performance fees			1,691,000	1,822,000	4,110,000	3,911,000
Investor Class Shares
Investment Management And Other Fees [Line Items]
Previous administrative fee rate		0.08%
Current annual administrative fee rate		0.10%
Institutional Class Shares
Investment Management And Other Fees [Line Items]
Previous administrative fee rate		0.06%
Current annual administrative fee rate		0.08%
Offshore Funds
Investment Management And Other Fees [Line Items]
Recorded advisory and performance fees			32,000	53,000	79,000	105,000
Offshore Funds | Investment Advisory Services
Investment Management And Other Fees [Line Items]
Number of offshore clients company provides advisory services for			2		2
Government Fund
Investment Management And Other Fees [Line Items]
Minimum yield waivers recoverable through 12/31/15					510,000
Minimum yield waivers recoverable through 12/31/16					$ 498,000