Deferred Policy Acquisition Costs - Summary of Activity with Respect to Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Beginning balance	$ 45,522	$ 57,695
Policy acquisition costs deferred	83,602	88,496
Amortization	(86,214)	(100,669)	$ (86,963)
Ending balance	$ 42,910	$ 45,522	$ 57,695