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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mutual fund administration:    
Administration revenue, gross $ 6,760,870 $ 6,379,960
12b-1/service fees and commission revenue received from fund clients 2,625,391 2,744,151
12b-1/service fees and commission expense payments to third parties (2,328,490) (2,373,863)
Fund related expense (3,268,063) (2,838,794)
Revenue, net of related expenses 3,789,708 3,911,454
DHCM C-Share financing:    
Broker commission advance repayments 193,310 251,360
Broker commission amortization (212,313) (244,943)
Financing activity, net (19,003) 6,417
Mutual fund administration revenue, net $ 3,770,705 $ 3,917,871