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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 ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 243,019	$ 360,254
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	109,183	139,565
Florida Hurricane Catastrophe Fund [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	107,537	165,022
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	26,299	39,459
Chubb Tempest Reinsurance LTD [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 0	$ 16,208

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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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