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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Total net realized investment gains (losses)	$ 847	$ (1,520)
Equity securities, Gross realized gains	875	627
Equity securities, Gross realized losses	(3)	(1,541)
Equity securities, Total net realized investment gains (losses)	872	(914)
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Gross realized gains	6	5
Gross realized losses	(31)	(611)
Total net realized investment gains (losses)	$ (25)	$ (606)

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