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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mutual fund administration:        
Administration revenue, gross $ 6,557,054 $ 6,445,936 $ 19,432,002 $ 20,557,388
12b-1/service fees and commission revenue received from fund clients 0 933,752 0 6,360,400
12b-1/service fees and commission expense payments to third parties 0 (831,198) 0 (5,660,429)
Fund related expense (3,576,598) (3,136,319) (10,214,948) (9,958,315)
Revenue, net of related expenses 2,980,456 3,412,171 9,217,054 11,299,044
DHCM C-Share financing:        
Broker commission advance repayments 101,238 157,732 315,283 558,641
Broker commission amortization (92,668) (144,738) (284,998) (545,463)
Financing activity, net 8,570 12,994 30,285 13,178
Mutual fund administration revenue, net $ 2,989,026 $ 3,425,165 $ 9,247,339 $ 11,312,222