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Liability for Unpaid Losses and Loss Adjustment Expenses - Supplementary Information About Average Historical Claims Duration (Detail)
Dec. 31, 2016
Insurance [Abstract]  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year one 64.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year two 14.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year three 8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year four 5.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year five 3.50%