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Subsequent Events - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Scenario, Forecast [Member]
Aug. 23, 2013
Subsequent Event [Member]
Jun. 30, 2013
Minimum [Member]
Scenario, Forecast [Member]
Aug. 23, 2013
Minimum [Member]
Investor Class Shares [Member]
Subsequent Event [Member]
Aug. 23, 2013
Minimum [Member]
Institutional Class Shares [Member]
Subsequent Event [Member]
Jun. 30, 2013
Maximum [Member]
Scenario, Forecast [Member]
Aug. 23, 2013
Maximum [Member]
Investor Class Shares [Member]
Subsequent Event [Member]
Aug. 23, 2013
Maximum [Member]
Institutional Class Shares [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]                  
Estimated transfer agency revenue, net   $ (1,310,000)              
Expenses on estimated agency transfer   1,470,000              
Estimated transition costs recognized       150,000     375,000    
Shareholder servicing fee 1,380,000                
Administrative fee rate         0.08% 0.06%   0.10% 0.08%
Administrative services fee, per fund     $ 10,000