Investments - Summary of Sales of Available-for-sale Fixed-Maturity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Available-for-sale Securities [Line Items]
Proceeds			$ 7,646	$ 12,083
Fixed-Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds	$ 1,616	$ 1,023	7,646	12,083
Gross Realized Gains	1	0	13	0
Gross Realized Losses	$ (11)	$ (12)	$ (55)	$ (750)