Deferred Policy Acquisition Costs - Schedule of Major Categories of the Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Charges Insurers [Abstract]
Agents’ commissions	$ 12,527	$ 13,244
Premium taxes	2,696	2,806
Deferred underwriting expenses	1,836	1,760
Total deferred policy acquisition costs	$ 17,059	$ 17,810	$ 19,048	$ 19,734