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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mutual fund administration:        
Administration revenue, gross $ 4,015,154 $ 3,216,646 $ 7,630,884 $ 6,326,505
12b-1/service fees and commission revenue received from fund clients 1,984,681 1,705,001 3,797,068 3,434,353
12b-1/service fees and commission expense payments to third parties (1,738,197) (1,435,822) (3,327,009) (2,794,067)
Fund related expense (1,460,656) (1,430,653) (2,800,429) (2,673,655)
Revenue, net of fund related expenses 2,800,982 2,055,172 5,300,514 4,293,136
DHCM C-Share financing:        
Broker commission advance repayments 64,674 58,262 121,332 120,670
Broker commission amortization (62,881) (53,632) (116,890) (114,878)
Financing activity, net 1,793 4,630 4,442 5,792
Mutual fund administration revenue, net $ 2,802,775 $ 2,059,802 $ 5,304,956 $ 4,298,928