Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer [Line Items]
Revenue	$ 39,021,114	$ 45,069,653	$ 81,277,500	$ 84,084,086
Administration revenue, gross
Revenue from External Customer [Line Items]
Revenue	6,481,081	8,103,606	13,421,253	15,030,019
Fund related expense
Revenue from External Customer [Line Items]
Expenses	3,868,132	4,750,380	7,830,804	9,231,463
Mutual fund administration revenue, net
Revenue from External Customer [Line Items]
Revenue	2,612,949	3,353,226	5,590,449	5,798,556
Mutual fund administration, net
Revenue from External Customer [Line Items]
Revenue	$ 2,612,949	$ 3,353,226	$ 5,590,449	$ 5,798,556