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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer [Line Items]
Revenue	$ 33,990,503	$ 42,256,386
Administration revenue, gross
Revenue from External Customer [Line Items]
Revenue	5,416,875	6,940,172
Fund related expense
Revenue from External Customer [Line Items]
Expenses	3,468,831	3,962,672
Mutual fund administration revenue, net
Revenue from External Customer [Line Items]
Revenue	$ 1,948,044	$ 2,977,500

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