Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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Name:	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Fixed maturities	$ (9,625)		$ (28,299)
Foreign currency fluctuations	(140)		(187)
Deferred taxes	1,918		5,623
Accumulated other comprehensive income (loss), net of tax	$ (7,847)	$ (18,051)	$ (22,863)	$ (38,117)	$ (37,171)	$ (43,058)