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Reinsurance - Current Ratings from Rating Agencies and Unsecured Net Amounts Due from Insurance Entities' Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Detail) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 0	$ 180,172,000
Allianz Risk Transfer [Member] | AM Best Company A+ [Member] | Standard and Poor's AA [Member] | Moody's Investors Service Aa3 [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total		105,573,000
Florida Hurricane Catastrophe Fund [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total		52,054,000
Renaissance Reinsurance Ltd [Member] | AM Best Company A+ [Member] | Standard and Poor's A+ [Member] | Moody's Investors Service A1 [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total		$ 22,545,000

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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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