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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mutual fund administration:        
Administration revenue, gross $ 6,465,152 $ 7,350,583 $ 12,874,949 $ 14,111,452
12b-1/service fees and commission revenue received from fund clients 0 2,801,257 0 5,426,648
12b-1/service fees and commission expense payments to third parties 0 (2,500,742) 0 (4,829,232)
Fund related expense (3,489,399) (3,553,932) (6,638,351) (6,821,995)
Revenue, net of related expenses 2,975,753 4,097,166 6,236,598 7,886,873
DHCM C-Share financing:        
Broker commission advance repayments 100,576 207,599 214,047 400,909
Broker commission amortization (92,112) (188,412) (192,332) (400,725)
Financing activity, net 8,464 19,187 21,715 184
Mutual fund administration revenue, net $ 2,984,217 $ 4,116,353 $ 6,258,313 $ 7,887,057