Reinsurance - Change in Allowance for Credit Losses on Amounts Recoverable from Reinsurers (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Insurance [Abstract]
Balance, beginning of period	$ 300	$ 360
Provision for credit loss benefit	(36)	(60)
Balance, end of period	$ 264	$ 300