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Reinsurance - Current Ratings from Rating Agencies and Unsecured Net Amounts Due from Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 114,107 | $ 773,345
Florida Hurricane Catastrophe Fund “FHCF” |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 91,275 | 134,411
Allianz Risk Transfer (Bermuda) Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 285,323
Chubb Tempest Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 51,319
Markel Bermuda Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 50,981
DaVinci Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 48,115
Renaissance Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 38,768
D E Shaw Re (Bermuda) Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 16,680
Munich Reinsurance America Inc. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 14,616
Everest Reinsurance Co |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 11,536
Upsilon RFO Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 11,201
Lumen Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 8,913
AM Best, A Rating | Standard & Poor's, A Plus Rating | Various Lloyd’s Of London Syndicates |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 22,832 | $ 101,482

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B + Details
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