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Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Balance as of January 1, 2021	$ 5,398	$ 6,521
Impairment	(578)	(1,123)
Balance as of December 31, 2022	4,820	5,398	$ 6,521
Commercial Specialty
Goodwill [Line Items]
Balance as of January 1, 2021	4,820	4,820
Impairment	0	0	0
Balance as of December 31, 2022	4,820	4,820	4,820
Exited Lines Segment
Goodwill [Line Items]
Balance as of January 1, 2021	578	1,701
Impairment	(578)	(1,123)
Balance as of December 31, 2022	$ 0	$ 578	$ 1,701

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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