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Liability for Unpaid Claims and Claim Adjustment Expenses - Summary of Average Annual Percentage Payout Incurred Claims (Detail)
Dec. 31, 2018
Credit  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year One 80.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Two 19.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Three 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Four 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Five 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Six 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Seven 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Eight 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Nine 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Ten 0.00%
Auto Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year One 34.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Two 28.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Three 15.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Four 9.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Five 5.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Six 2.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Seven 1.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Eight 0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Nine 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Ten 2.60%
Non-Auto Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year One 18.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Two 20.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Three 16.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Four 14.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Five 8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Six 5.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Seven 2.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Eight 1.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Nine 1.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Ten 10.50%
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year One 75.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Two 19.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Three 2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Four 1.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Five 0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Six 0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Seven 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Eight 0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Nine 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Ten 1.10%
Commercial Multi-Peril  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year One 35.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Two 15.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Three 10.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Four 13.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Five 9.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Six 4.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Seven 2.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Eight 0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Nine 0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Ten 7.90%
Short Tail Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year One 89.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Two 10.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Three 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Four 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Five 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Six 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Seven 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Eight 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Nine 0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Year Ten 0.00%