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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Insurance [Abstract] |  |  |  |  |
Estimated of ultimate losses on storm | $ 754,000 |  | $ 754,000 |  | $ 446,700
Prior year adverse development direct losses |  |  | 311,700 |  |
Net losses after benefit of reinsurance recoveries from prior year adverse development losses | $ (39) | $ 113 | $ 2,227 | $ 1,318 |
Loss reserve development on direct basis |  |  |  | 6,900 |
Loss reserve development on net basis |  |  |  | $ 1,300 |

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Prior year adverse development direct losses. + References No definition available. + Details
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