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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 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 823,105 | $ 200,967
Allianz Risk Transfer | AM Best Company A Plus Rating | Standard & Poor's, AA- Rating | Moody's, Aa3 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 371,290 | 0
Various Lloyd’s of London Syndicates | AM Best, A Rating | Standard & Poor's, A Plus Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 132,967 | 0
Chubb Tempest Reinsurance, Ltd. | AM Best, A++ Rating | Standard & Poor's, AA Rating | Moody's, Aa3 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 62,592 | 0
Florida Hurricane Catastrophe Fund |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 61,024 | 136,298
DaVinci Reinsurance Ltd. | AM Best, A Rating | Standard & Poor's, AA- Rating | Moody's, A3 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 58,290 | 0
Renaissance Reinsurance Ltd. | AM Best Company A Plus Rating | Standard & Poor's, A Plus Rating | Moody's A1 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 49,773 | 20,051
Markel Bermuda Ltd. | AM Best, A Rating | Standard & Poor's, A Rating | Moody's, A2 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 46,770 | 0
Munich Reinsurance America Inc. | AM Best Company A Plus Rating | Standard & Poor's, AA- Rating | Moody's, Aa3 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 19,122 | 0
Everest Reinsurance Co | AM Best Company A Plus Rating | Standard & Poor's, A Plus Rating | Moody's A1 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 11,994 | 0
Lumen Re Ltd. | AM Best, A Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 9,283 | 0
Allianz Risk Transfer (Bermuda) Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 0 | $ 44,618

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