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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule Of Available For Sale Securities [Line Items]
Total net realized investment gains (losses)	$ (512)	$ (133)	$ 540	$ (2,414)
Equity securities, Gross realized gains	295	163	1,384	726
Equity securities, Gross realized losses	(6)	(178)	(11)	(1,829)
Equity securities, Total net realized investment gains (losses)	289	(15)	1,373	(1,103)
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Gross realized gains	5	15	54	29
Gross realized losses	(806)	(133)	(887)	(1,340)
Total net realized investment gains (losses)	$ (801)	$ (118)	$ (833)	$ (1,311)

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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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