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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, 2018 | Dec. 31, 2017
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 360,254 | $ 180,172
Florida Hurricane Catastrophe Fund |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 165,022 | 52,054
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 total | 139,565 | 105,573
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 total | 39,459 | 22,545
Chubb Tempest Reinsurance Ltd | AM Best Company A Plus Plus Rating | Standard & Poor's, AA Rating | Moody's, Aa3 Rating |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 16,208 | $ 0

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