Reinsurance - Total Ceded Reinsurance Transactions with both Affiliated and Unaffiliated Reinsurers (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Premiums earned	$ 314,859,014	$ 326,198,234	$ 310,179,267
Prepaid reinsurance premiums	142,475,767	135,379,777
Affiliated Entity and Unaffiliated Entity [Member]
Ceded Credit Risk [Line Items]
Premiums earned	314,859,014	326,198,234	310,179,267
Losses and loss expenses	240,241,845	246,223,074	218,523,260
Prepaid reinsurance premiums	142,475,767	135,379,777	135,032,641
Liability for losses and loss expenses	$ 362,768,427	$ 339,267,525	$ 293,271,257