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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, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 360,254	$ 180,172
Florida Hurricane Catastrophe Fund
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	165,022	52,054
Allianz Risk Transfer | AM Best Company A Plus Rating | Standard & Poor's, AA Rating | Moody's, Aa3 Rating
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	139,565	105,573
Renaissance Reinsurance Ltd | AM Best Company A Plus Rating | Standard & Poor's, A Plus Rating | Moody's A1 Rating
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	39,459	22,545
Chubb Tempest Reinsurance Ltd | AM Best Company A Plus Plus Rating | Standard & Poor's, AA Rating | Moody's, Aa3 Rating
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 16,208	$ 0

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