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Components of Net Realized Investment Gains (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Net interest settlements	$ 0	$ 2,553	$ 0	$ 9,093
Interest Rate Swap
Schedule Of Available For Sale Securities [Line Items]
Net interest settlements		$ 500	$ 0	$ 3,000	$ 0

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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