Reinsurance - Schedule of the Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums Written and Earned [Abstract]
Gross Written	$ 276,110	$ 278,294	$ 303,090
Ceded Written	(10,527)	(10,469)	(10,276)
Net premiums Written	265,583	267,825	292,814
Gross Earned	282,225	286,462	314,703
Ceded Earned	(10,527)	(10,469)	(10,276)
Net premiums Earned	$ 271,698	$ 275,993	$ 304,427