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Schedule of Impairments on Investments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	[1]	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Impairment related to intent to sell	$ (26,205)		$ 0	$ (760)
Total	$ (26,205)		$ 0	$ (760)
[1] In response to a rising interest rate environment, the Company took action early in April 2022 to shorten the duration of its fixed maturities portfolio. In connection with these actions, the Company identified fixed maturities securities with a weighted average life of five years or greater as having an intent to sell, the majority of which were sold in the 2nd quarter of 2022. Most of the proceeds from the sale of these securities were reinvested into fixed income investments with maturities of approximately two years. As a result of these actions, book yield increased from 2.2% at December 31, 2021 to 3.5% at December 31, 2022.

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