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Liability for Losses and Loss Expenses - Supplementary Information About Average Historical Claims Duration (Detail)
Dec. 31, 2017
Personal Automobile [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 65.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 17.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 8.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 4.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6 0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9 0.20%
Homeowners [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 80.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 16.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 1.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6 0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 0.10%
Commercial Automobile [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 47.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 18.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 12.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 10.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 6.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6 2.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 1.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 0.10%
Commercial Multi-Peril [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 50.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 17.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 9.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 9.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 5.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6 3.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 1.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9 0.20%
Workers' Compensation [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 28.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 31.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 16.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 8.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 5.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6 2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 1.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9 0.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10 0.50%