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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mutual fund administration:        
Administration revenue, gross $ 5,565,081 $ 4,015,154 $ 10,608,498 $ 7,630,884
12b-1/service fees and commission revenue received from fund clients 2,689,494 1,984,681 5,171,264 3,797,068
12b-1/service fees and commission expense payments to third parties (2,342,897) (1,738,197) (4,499,409) (3,327,009)
Fund related expense (2,419,569) (1,439,651) (4,508,744) (2,760,223)
Revenue, net of fund related expenses 3,492,109 2,821,987 6,771,609 5,340,720
DHCM C-Share financing:        
Broker commission advance repayments 218,108 64,674 391,999 121,332
Broker commission amortization (210,100) (62,881) (385,202) (116,890)
Financing activity, net 8,008 1,793 6,797 4,442
Mutual fund administration revenue, net $ 3,500,117 $ 2,823,780 $ 6,778,406 $ 5,345,162