Deferred Policy Acquisition Costs - Schedule of Activity in the Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 19,151	$ 17,975	$ 17,401
Policy acquisition costs deferred	46,158	43,348	41,433
Amortization expense during the year	(44,224)	(42,172)	(40,859)
Balance, end of year	$ 21,085	$ 19,151	$ 17,975