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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Claims Development [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ (205,069,000) | $ 224,404,000 | $ 189,931,000 |
Unpaid losses and loss adjustment expenses | 267,760,000 | 472,829,000 | 248,425,000 | $ 58,494,000
Policy holder benefits and claims incurred, ceded | 481,198,000 | 910,868,000 | 428,694,000 |
Policyholder benefits and claims incurred, net | 603,406,000 | 414,455,000 | 350,428,000 |
Prior year claims and claims adjustment expense | 88,068,000 | 99,522,000 | $ 27,499,000 |
Prior years adverse reserve development incurred, net | $ 47,400,000 |  |  |
Insurance claim maximum settlement time | 1 year |  |  |
Initial case reserve for claims | $ 2,500 |  |  |
LAE case reserves | 0 |  |  |
Subrogation [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Salvage and subrogation receivables | 73,000,000 | $ 99,000,000 |  |
Decrease In salvage and subrogation recoveries, value | 40,700,000 |  |  |
Hurricane [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Policy holder benefits and claims incurred, ceded | 469,900,000 |  |  |
Policyholder benefits and claims incurred, net | $ 4,500,000 |  |  |

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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=118932676&loc=d3e3602-108585 + Details
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- Definition The amount needed 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 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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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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