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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, 2022 | Dec. 31, 2021
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 773,345 | $ 200,967
Florida Hurricane Catastrophe Fund “FHCF” |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 134,411 | 136,298
D E Shaw Re (Bermuda) Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 16,680 | 0
Upsilon RFO Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 11,201 | 0
Allianz Risk Transfer (Bermuda) Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 0 | 44,618
AM Best Company A Plus Rating | Moody's, Aa3 Rating | Standard & Poor's, AA- Rating | Allianz Risk Transfer |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 285,323 | 0
AM Best Company A Plus Rating | Moody's, Aa3 Rating | Standard & Poor's, AA- Rating | Munich Reinsurance America Inc. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 14,616 | 0
AM Best Company A Plus Rating | Moody's A1 Rating | Standard & Poor's, A Plus Rating | Renaissance Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 38,768 | 20,051
AM Best Company A Plus Rating | Moody's A1 Rating | Standard & Poor's, A Plus Rating | Everest Reinsurance Co |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 11,536 | 0
AM Best, A Rating | Lumen Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 8,913 | 0
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 | 101,482 | 0
AM Best, A Rating | Moody's, A2 Rating | Standard & Poor's, A Rating | Markel Bermuda Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 50,981 | 0
AM Best, A Rating | Moody's, A3 Rating | Standard & Poor's, A Plus Rating | DaVinci Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 48,115 | 0
AM Best, A++ Rating | Moody's, Aa3 Rating | Standard & Poor's, AA Rating | Chubb Tempest Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 51,319 | $ 0

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