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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, 2016	Dec. 31, 2015
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 46,364	$ 60,828
Florida Hurricane Catastrophe Fund [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 46,364	42,086
Odyssey Reinsurance Company [Member] | AM Best, A Rating [Member] | Standard & Poor's, A- Rating [Member] | Moody's, A3 Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total		$ 18,742

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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.

+ References

No definition available.

+ Details

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- Details

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