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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mutual fund administration:        
Administration revenue, gross $ 6,445,936 $ 6,768,161 $ 20,557,388 $ 20,031,572
12b-1/service fees and commission revenue received from fund clients 933,752 2,753,785 6,360,400 8,297,126
12b-1/service fees and commission expense payments to third parties (831,198) (2,372,516) (5,660,429) (7,164,887)
Fund related expense (3,136,319) (3,224,405) (9,958,315) (8,971,327)
Revenue, net of related expenses 3,412,171 3,925,025 11,299,044 12,192,484
DHCM C-Share financing:        
Broker commission advance repayments 157,732 269,602 558,641 768,884
Broker commission amortization (144,738) (246,254) (545,463) (731,813)
Financing activity, net 12,994 23,348 13,178 37,071
Mutual fund administration revenue, net $ 3,425,165 $ 3,948,373 $ 11,312,222 $ 12,229,555