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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule Of Available For Sale Securities [Line Items]
Total net realized investment gains (losses)	$ (3,994)	$ (512)	$ (3,731)	$ 540
Equity securities, Gross realized gains	38	295	322	1,384
Equity securities, Gross realized losses	(4,005)	(6)	(4,005)	(11)
Net realized gains (losses)	(3,967)	289	(3,683)	1,373
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Gross realized gains	8	5	69	54
Gross realized losses	(35)	(806)	(117)	(887)
Total net realized investment gains (losses)	$ (27)	$ (801)	$ (48)	$ (833)

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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