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Supplementary Insurance Information Unallocated Corporate Items (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Net Investment Income	$ 62,375	$ 55,444	$ 27,627
Corporate and Other Operating Expenses	$ 25,696	$ 23,383	$ 24,421

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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
-Topic 944
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16(Column G))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1

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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
-Topic 944
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16(Column J))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1

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