Reinsurance - Schedule of the Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Premiums Written and Earned [Abstract]
Gross Written	$ 285,355	$ 276,110	$ 278,294
Ceded Written	(16,621)	(10,527)	(10,469)
Net premiums Written	268,734	265,583	267,825
Gross Earned	283,746	282,225	286,462
Ceded Earned	(16,621)	(10,527)	(10,469)
Net premiums Earned	$ 267,125	$ 271,698	$ 275,993