Deferred Policy Acquisition Costs - Schedule of Activity in the Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 17,059	$ 17,810	$ 19,048
Policy acquisition costs deferred	40,194	37,730	40,345
Amortization expense during the year	(39,852)	(38,481)	(41,583)
Balance, end of year	$ 17,401	$ 17,059	$ 17,810