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Other Comprehensive Income (Loss) - Reclassifications Adjustment for Gains (Losses) Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	$ 4,319			$ 53,827			$ 5,357	$ 54,294
Income tax expense (benefit)	(6,281)			623			(24,342)	(14,450)
Net income (loss)	20,183	$ 21,941	$ 26,408	(3,169)	$ 19,882	$ 20,067	68,532	36,780
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	690			53,827			243	54,294
Income tax expense (benefit)	(164)			(13,247)			(57)	(13,362)
Net income (loss)	$ 526			$ 40,580			$ 186	$ 40,932

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