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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Mutual fund administration:
Administration revenue, gross	$ 6,169,984	$ 6,557,054	$ 18,771,040	$ 19,432,002
Fund related expense	3,638,618	3,576,598	10,702,498	10,214,948
Revenue, net of related expenses	2,531,366	2,980,456	8,068,542	9,217,054
Share Financing [Abstract]
Broker commission advance repayments	84,248	101,238	264,107	315,283
Broker commission amortization	(72,172)	(92,668)	(237,053)	(284,998)
Financing activity, net	12,076	8,570	27,054	30,285
Mutual fund administration revenue, net	$ 2,543,442	$ 2,989,026	$ 8,095,596	$ 9,247,339