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Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reserves For Losses And Loss Adjustment Expenses [Line Items] |  |  |  |
Unpaid claims and claim adjustment expenses overall development | $ 1,200 | $ 2,150 | $ 2,825 | $ 7,702
Accidental Year 2017,2015 and Prior [Member] |  |  |  |
Reserves For Losses And Loss Adjustment Expenses [Line Items] |  |  |  |
Unpaid claims and claim adjustment expenses overall development | $ 1,200 |  |  |
Accidental Year 2019 and Prior [Member] |  |  |  |
Reserves For Losses And Loss Adjustment Expenses [Line Items] |  |  |  |
Unpaid claims and claim adjustment expenses overall development |  |  | 2,825 |
Accidental Year 2020 [Member] | Hurricane Sally [Member] |  |  |  |
Reserves For Losses And Loss Adjustment Expenses [Line Items] |  |  |  |
Unpaid claims and claim adjustment expenses overall development |  |  | $ 17,700 |

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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=116884095&loc=d3e14764-158437 + Details
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