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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items] |  |  |
Investment income | $ 29,776 | $ 39,662 | $ 31,487
Investment expense | (2,149) | (2,642) | (3,095)
Net investment income | 27,627 | 37,020 | 28,392
Fixed Income Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Investment income | 33,852 | 25,751 | 31,987
Equity Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Investment income | 1,100 | 2,692 | 4,944
Cash and Cash Equivalents |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Investment income | 790 | 363 | 784
Other Invested Assets |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Investment income | $ (5,966) | $ 10,856 | $ (6,228)

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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