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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mutual fund administration:        
Administration revenue, gross $ 6,074,294 $ 4,320,959 $ 16,682,792 $ 11,951,844
12b-1/service fees and commission revenue received from fund clients 2,691,398 2,277,421 7,862,662 6,074,489
12b-1/service fees and commission expense payments to third parties (2,315,084) (1,992,664) (6,814,493) (5,319,674)
Fund related expense (2,545,768) (1,632,500) (7,054,512) (4,392,723)
Revenue, net of fund related expenses 3,904,840 2,973,216 10,676,449 8,313,936
DHCM C-Share financing:        
Broker commission advance repayments 235,054 100,003 627,052 221,335
Broker commission amortization (222,430) (96,998) (607,631) (213,888)
Financing activity, net 12,624 3,005 19,421 7,447
Mutual fund administration revenue, net $ 3,917,464 $ 2,976,221 $ 10,695,870 $ 8,321,383