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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mutual fund administration:        
Administration revenue, gross $ 7,350,583 $ 6,883,451 $ 14,111,452 $ 13,263,411
12b-1/service fees and commission revenue received from fund clients 2,801,257 2,799,190 5,426,648 5,543,341
12b-1/service fees and commission expense payments to third parties (2,500,742) (2,418,508) (4,829,232) (4,792,371)
Fund related expense (3,553,932) (2,908,128) (6,821,995) (5,746,922)
Revenue, net of related expenses 4,097,166 4,356,005 7,886,873 8,267,459
DHCM C-Share financing:        
Broker commission advance repayments 207,599 247,922 400,909 499,281
Broker commission amortization (188,412) (240,616) (400,725) (485,558)
Financing activity, net 19,187 7,306 184 13,723
Mutual fund administration revenue, net $ 4,116,353 $ 4,363,311 $ 7,887,057 $ 8,281,182