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Reinsurance - Current Ratings from Rating Agencies and Unsecured Net Amounts Due from Insurance Entities' Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 218,492 | $ 360,254
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 128,720 | 165,022
Allianz Risk Transfer [Member] | AM Best Company A+ [Member] | Standard and Poor's AA [Member] | Moody's Investors Service Aa3 [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 69,891 | 139,565
Renaissance Reinsurance Ltd [Member] | AM Best Company A+ [Member] | Standard and Poor's A+ [Member] | Moody's Investors Service A1 [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 19,881 | 39,459
Chubb Tempest Reinsurance LTD [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 0 | $ 16,208

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