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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	Sep. 30, 2017	Dec. 31, 2016
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 297,116	$ 46,364
Allianz Risk Transfer [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	186,479
AXIS Specialty Limited [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	16,929
Everest Reinsurance Company [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	63,104
Florida Hurricane Catastrophe Fund [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total		$ 46,364
Renaissance Reinsurance Ltd [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 30,604

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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.

+ Details

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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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