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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mutual fund administration:        
Administration revenue, gross $ 6,883,451 $ 5,565,081 $ 13,263,411 $ 10,608,498
12b-1/service fees and commission revenue received from fund clients 2,799,190 2,689,494 5,543,341 5,171,264
12b-1/service fees and commission expense payments to third parties (2,418,508) (2,342,897) (4,792,371) (4,499,409)
Fund related expense (2,908,128) (2,419,569) (5,746,922) (4,508,744)
Revenue, net of related expenses 4,356,005 3,492,109 8,267,459 6,771,609
DHCM C-Share financing:        
Broker commission advance repayments 247,922 218,108 499,281 391,999
Broker commission amortization (240,616) (210,100) (485,558) (385,202)
Financing activity, net 7,306 8,008 13,723 6,797
Mutual fund administration revenue, net $ 4,363,311 $ 3,500,117 $ 8,281,182 $ 6,778,406