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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, 2018 | Dec. 31, 2017
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 59,829 | $ 180,172
Allianz Risk Transfer [Member] | AM Best Company A+ [Member] | Standard and Poor's AA- [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 39,007 | 105,573
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 20,822 | 52,054
Renaissance Reinsurance Ltd [Member] | AM Best Company A+ [Member] | Standard and Poor's AA- [Member] | Moody's Investors Service A1 [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total |  | $ 22,545

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