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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) netLossRatioPoint | Dec. 31, 2021 USD ($) netLossRatioPoint | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Claims Development [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses |  | $ 692,574,000 | $ 23,751,000 | $ 54,705,000 |
Unpaid losses and loss adjustment expenses |  | 1,038,790,000 | 346,216,000 | 322,465,000 | $ 267,760,000
Policyholder benefits and claims incurred, gross |  | 1,972,541,000 | 1,189,444,000 | 1,080,058,000 |
Incurred (recovered) related to current year |  | 913,419,000 | 724,755,000 | 700,473,000 |
Incurred (recovered) related to prior year |  | 24,980,000 | 54,450,000 | 58,337,000 |
Policyholder benefits and claims incurred, ceded |  | $ 1,034,142,000 | $ 410,239,000 | $ 321,248,000 |
Insurance claim maximum settlement time |  | 1 year |  |  |
Initial case reserve for claims |  | $ 2,500 |  |  |
LAE case reserves |  | $ 0 |  |  |
Adverse Prior Years' Reserve Development |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Net loss ratio | netLossRatioPoint |  | 2.2 | 5.3 |  |
Incurred (recovered) related to prior year |  | $ 25,000,000.0 | $ 54,500,000 |  |
Hurricane Ian |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred (recovered) related to current year | $ 66,000,000 | $ 111,000,000 |  |  |
Net loss ratio | netLossRatioPoint |  | 9.9 | 2.7 |  |
Incurred (recovered) related to prior year |  | $ 28,000,000.0 |  |  |
Subrogation |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Subrogation recoveries value |  | $ 134,400,000 | $ 118,600,000 |  |

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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 https://asc.fasb.org/extlink&oid=126954810&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 https://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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + 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 https://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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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