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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue from External Customer [Line Items]
Revenue	$ 42,256,386	$ 39,014,433
Administration revenue, gross
Revenue from External Customer [Line Items]
Revenue	6,940,172	6,960,008
Fund related expense
Revenue from External Customer [Line Items]
Expenses	3,962,672	4,514,678
Mutual fund administration revenue, net
Revenue from External Customer [Line Items]
Revenue	2,977,500	2,445,330
Mutual fund administration, net
Revenue from External Customer [Line Items]
Revenue	$ 2,977,500	$ 2,445,330

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