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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mutual fund administration:        
Administration revenue, gross $ 6,768,161 $ 6,074,294 $ 20,031,572 $ 16,682,792
12b-1/service fees and commission revenue received from fund clients 2,753,785 2,691,398 8,297,126 7,862,662
12b-1/service fees and commission expense payments to third parties (2,372,516) (2,315,084) (7,164,887) (6,814,493)
Fund related expense (3,224,405) (2,545,768) (8,971,327) (7,054,512)
Revenue, net of related expenses 3,925,025 3,904,840 12,192,484 10,676,449
DHCM C-Share financing:        
Broker commission advance repayments 269,602 235,054 768,884 627,052
Broker commission amortization (246,254) (222,430) (731,813) (607,631)
Financing activity, net 23,348 12,624 37,071 19,421
Mutual fund administration revenue, net $ 3,948,373 $ 3,917,464 $ 12,229,555 $ 10,695,870