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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	Sep. 30, 2021	Dec. 31, 2020
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	$ 94,545	$ 257,322
Florida Hurricane Catastrophe Fund
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	52,992	121,298
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	41,553	96,652
Allianz Risk Transfer
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	0	21,087
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	$ 0	$ 18,285

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- Definition

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