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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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments									$ 5,892	$ 63,352	$ (12,715)
Income taxes									(8,006)	(5,126)	(17,003)
Net income	$ (48,125)	$ 20,183	$ 21,941	$ 26,408	$ (17,675)	$ (3,169)	$ 19,882	$ 20,067	20,407	19,105	46,514
Net changes related to available-for-sale securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments									215	56,914	492
Income taxes									(50)	(13,605)	(121)
Net income									$ 165	$ 43,309	$ 371

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