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Reinsurance - Amounts Represent Effect of Reinsurance on Premiums Earned (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reinsurance Disclosures [Abstract]
Direct									$ 591,101,804	$ 593,976,241	$ 561,178,447
Assumed									479,835,610	473,512,866	451,515,575
Ceded									(314,859,014)	(326,198,234)	(310,179,267)
Net premiums earned	$ 189,420,787	$ 189,821,058	$ 188,763,313	$ 188,073,242	$ 186,150,478	$ 187,661,705	$ 185,714,110	$ 181,764,580	$ 756,078,400	$ 741,290,873	$ 702,514,755
Percentage of assumed premiums earned to net premiums earned									63.50%	63.90%	64.30%

X

- Definition

Amount of earned premiums assumed from other entities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

Amount of earned premiums ceded to other entities.

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X

- Definition

Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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Percentage of assumed premium earned to premium earned after effects of reinsurance, as disclosed in supplementary reinsurance information.

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