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Supplementary Insurance Information Unallocated Corporate Items (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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- 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 + Details
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