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Losses and Loss Adjustment Expenses - Supplementary and Unaudited Information about Average Historical Claims Duration (Detail)
Dec. 31, 2023
Homeowners Multi-peril and Dwelling Fire Insurance [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 1 47.20%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 2 22.30%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 3 8.50%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 4 3.90%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 5 0.20%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 6 0.80%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 7 0.30%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 8 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 9 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 10 0.00%
Homeowners Wind-only Insurance [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 1 29.20%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 2 23.20%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 3 13.50%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 4 8.50%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 5 0.10%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 6 0.40%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 7 0.70%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 8 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 9 0.00%
Losses Specific To Any Hurricane And Storm Events Prior To 2023 [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 1 51.80%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 2 22.10%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 3 6.90%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 4 4.90%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 5 1.70%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 6 0.50%
Other Short-Duration Insurance Lines [Member]  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 1 74.90%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 2 23.10%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 3 1.50%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 4 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 5 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 6 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 7 0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance, Year 8 0.00%