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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments									$ 348	$ 5,892	$ 63,352
Income taxes, current									4,990	(8,006)	(5,126)
Net of tax	$ 25,111	$ (72,275)	$ 7,370	$ 17,537	$ (48,125)	$ 20,183	$ 21,941	$ 26,408	(22,257)	20,407	19,105
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments									(1,818)	215	56,914
Income taxes, current									447	(50)	(13,605)
Net of tax									$ (1,371)	$ 165	$ 43,309

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