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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 ($) | Sep. 30, 2018 | Dec. 31, 2017
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Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 0 | $ 180,172,000
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 |  | 105,573,000
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total |  | 52,054,000
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 |  | $ 22,545,000

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