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Loss and Loss Adjustment Expenses - Summary Exposures to Various Asbestos Related Claims (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Asbestos Claims [Line Items] |  |  |
Balance, beginning of period | $ 696,037 | $ 745,278 | $ 760,561
Incurred losses and LAE during the current year | 148,263 | 152,316 | 160,798
Balance, end of period | 673,994 | 696,037 | 745,278
Asbestos Issue [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Balance, beginning of period | 248 | 260 | 318
Incurred losses and LAE during the current year | 15 | (2) | (44)
Loss and LAE payments | 47 | (10) | (14)
Balance, end of period | $ 310 | $ 248 | $ 260

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- Definition Asbestos Claims [Line Items] + References No definition available. + Details
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- Definition Loss and loss adjustment expenses payments or recoveries. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Details
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