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Liability for Losses and Loss Expenses - Supplementary Information About Average Historical Claims Duration (Detail)
Dec. 31, 2018
Personal Automobile [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 64.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 17.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 8.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 4.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 2.60%
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 81.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 16.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 1.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 0.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 0.30%
Commercial Automobile [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 44.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 18.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 13.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 10.70%
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 2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10 0.10%
Commercial Multi-Peril [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 49.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 17.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 10.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 9.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 6.10%
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 1.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 1.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9 0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10 0.60%
Workers' Compensation [Member]  
Claims Development [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1 29.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2 31.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3 16.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4 8.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5 4.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6 2.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7 1.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8 0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9 1.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10 0.50%