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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, 2017 | Dec. 31, 2016
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Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 180,172 | $ 46,364
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 | 105,573 |
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 52,054 | $ 46,364
Renaissance Reinsurance Ltd [Member] | AM Best Company A+ [Member] | Standard and Poor's AA- [Member] | Moody's A1 [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 22,545 |

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