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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, 2022 | Dec. 31, 2021
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 133,085 | $ 200,967
Florida Hurricane Catastrophe Fund |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 49,707 | 136,298
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 | 45,579 | 0
Allianz Risk Transfer (Bermuda) Ltd. | 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 | 25,724 | 44,618
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 | $ 12,075 | $ 20,051

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