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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mutual fund administration:    
Administration revenue, gross $ 6,607,337 $ 6,436,359
Fund related expense (3,468,325) (3,148,951)
Revenue, net of related expenses 3,139,012 3,287,408
DHCM C-Share financing:    
Broker commission advance repayments 96,478 113,470
Broker commission amortization (84,778) (100,220)
Financing activity, net 11,700 13,250
Mutual fund administration revenue, net $ 3,150,712 $ 3,300,658