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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	Mar. 31, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	$ 133,085	$ 200,967
Florida Hurricane Catastrophe Fund
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	49,707	136,298
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	45,579	0
Allianz Risk Transfer (Bermuda) Ltd. | 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	25,724	44,618
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	$ 12,075	$ 20,051

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