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Supplementary Information of Average Historical Claims (Detail)
Dec. 31, 2016
Commercial Lines Segment | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 65.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 22.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 3.10%
Commercial Lines Segment | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 6.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 17.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 20.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 16.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 10.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 6.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 1.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 0.70%
Personal Lines Segment | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 81.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 16.80%
Personal Lines Segment | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 16.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 25.50%
Reinsurance Operations | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 14.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 46.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 13.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 3.10%
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 0.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 0.10%
Reinsurance Operations | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 9.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 10.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 10.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 15.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 3.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 11.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 18.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 1.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 0.10%