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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
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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- Definition

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- Definition

Represents total unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of stockholders' equity as of the reporting date.

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No definition available.

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