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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mutual fund administration:    
Administration revenue, gross $ 6,436,359 $ 6,760,870
12b-1/service fees and commission revenue received from fund clients 0 2,625,391
12b-1/service fees and commission expense payments to third parties 0 (2,328,490)
Fund related expense (3,148,951) (3,268,063)
Revenue, net of related expenses 3,287,408 3,789,708
DHCM C-Share financing:    
Broker commission advance repayments 113,470 193,310
Broker commission amortization (100,220) (212,313)
Financing activity, net 13,250 (19,003)
Mutual fund administration revenue, net $ 3,300,658 $ 3,770,705