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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Realized Investment Gains (Losses), Total		$ 455	$ (2,107)	$ (32,929)
Equity securities, Gross realized gains		1,325	1,061	2,289
Equity securities, Gross realized losses		(14)	(1,514)	(5,681)
Equity securities, Total net realized investment gains (losses)		1,311	(453)	(3,392)
Not Designated as Hedging Instrument | Interest Rate Swap
Schedule Of Available For Sale Securities [Line Items]
Gross realized gains		0	0	12,844
Gross realized losses		0	0	(2,771)
Realized Investment Gains (Losses), Total	[1]	0	0	10,073
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Gross realized gains		54	49	688
Gross realized losses		(910)	(1,703)	(40,298)
Realized Investment Gains (Losses), Total		$ (856)	$ (1,654)	$ (39,610)
[1] Includes periodic net interest settlements related to the derivatives of $3.0 million for the year ended December 31, 2022.

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