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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Mutual fund administration:
Administration revenue, gross	$ 5,993,719	$ 6,465,152	$ 12,601,056	$ 12,874,949
Fund related expense	3,595,555	3,489,399	7,063,880	6,638,351
Revenue, net of related expenses	2,398,164	2,975,753	5,537,176	6,236,598
Share Financing [Abstract]
Broker commission advance repayments	83,380	100,576	179,858	214,047
Broker commission amortization	(80,102)	(92,112)	(164,880)	(192,332)
Financing activity, net	3,278	8,464	14,978	21,715
Mutual fund administration revenue, net	$ 2,401,442	$ 2,984,217	$ 5,552,154	$ 6,258,313