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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, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 257,322	$ 218,916
Florida Hurricane Catastrophe Fund [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	121,298	199,647
Allianz Risk Transfer (Bermuda) Ltd. | AM Best Company A Plus Rating [Member] | Standard & Poor's, AA Rating [Member] | Moody's, Aa3 Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	96,652	0
Allianz Risk Transfer [Member] | AM Best Company A Plus Rating [Member] | Standard & Poor's, AA Rating [Member] | Moody's, Aa3 Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	21,087	19,269
Renaissance Reinsurance Ltd [Member] | AM Best Company A Plus Rating [Member] | Standard & Poor's, A Plus Rating [Member] | Moody's A1 Rating [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 18,285	$ 0

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