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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Claims Development [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 54,705,000 | $ (205,069,000) | $ 224,404,000 |
Unpaid losses and loss adjustment expenses | 322,465,000 | 267,760,000 | 472,829,000 | $ 248,425,000
Policyholder benefits and claims incurred, gross | 1,080,058,000 | 1,084,604,000 | 1,325,323,000 |
Policyholder benefits and claims incurred, net | 758,810,000 | 603,406,000 | 414,455,000 |
Incurred (recovered) related to prior years | $ 58,337,000 | 88,068,000 | 99,522,000 |
Term of notice | 3 years |  |  |
Insurance claim maximum settlement time | 1 year |  |  |
Initial case reserve for claims | $ 2,500 |  |  |
LAE case reserves | 0 |  |  |
Incurred (recovered) related to current year | 700,473,000 | 515,338,000 | $ 314,933,000 |
Subrogation [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Subrogation recoveries value | 71,000,000 | $ 73,000,000 |  |
Hurricane Sally [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Policyholder benefits and claims incurred, gross | 133,400,000 |  |  |
Policyholder benefits and claims incurred, net | 43,000,000.0 |  |  |
Other Weather Events [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Policyholder benefits and claims incurred, gross | 123,500,000 |  |  |
Policyholder benefits and claims incurred, net | 119,000,000.0 |  |  |
Hurricanes and Accidents Excluding Hurricanes [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Policyholder benefits and claims incurred, gross | 284,300,000 |  |  |
Incurred (recovered) related to prior years | 58,300,000 |  |  |
Accidents Excluding Hurricanes [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Policyholder benefits and claims incurred, gross | 42,100,000 |  |  |
Incurred (recovered) related to prior years | 40,200,000 |  |  |
Hurricane [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Policyholder benefits and claims incurred, gross | 242,200,000 |  |  |
Incurred (recovered) related to prior years | $ 18,100,000 |  |  |

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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period 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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