Investments - Summary of Net Investment Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investment [Line Items]
Investment expense	$ (273)	$ (365)	$ (296)
Interest Income, Debt Securities, Available-for-Sale, Operating	10,916	14,563	12,687
Investment income	10,647	14,448	13,159
Fixed income securities		4,895	3,696
Available-for-sale Securities [Member]
Investment [Line Items]
Fixed income securities	5,175
Short-term Investments [Member]
Investment [Line Items]
Fixed income securities	6,014	10,033	9,287
Other Investments [Member]
Investment [Line Items]
Fixed income securities	$ (269)	$ (115)	$ 472