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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 655,119 | $ 773,345
Florida Hurricane Catastrophe Fund |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 92,193 | 134,411
D E Shaw Re (Bermuda) Ltd |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 27,399 | 16,680
Cosaint Re Pte. Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 17,467 | 0
Upsilon RFO Re Ltd |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 11,201
Lumen Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 8,913
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 | 243,564 | 285,323
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 | 12,156 | 14,616
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 | 30,896 | 38,768
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 | 12,471 | 11,536
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 | 86,774 | 101,482
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 | 44,361 | 50,981
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 | 41,097 | 48,115
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 | $ 46,741 | $ 51,319

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