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Supplementary Insurance Information Unallocated Corporate Items (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Net Investment Income	$ 27,627	$ 37,020	$ 28,392
Corporate and Other Operating Expenses	$ 24,421	$ 27,179	$ 41,998

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- References

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- Definition

Amount of net investment income earned, disclosed in supplementary insurance information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16(Column G))
-URI https://asc.fasb.org/extlink&oid=120401096&loc=d3e574960-122915

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Amount of operating expense classified as other, disclosed in supplementary insurance information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16(Column J))
-URI https://asc.fasb.org/extlink&oid=120401096&loc=d3e574960-122915

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