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Reserves for Losses and Loss Adjustment Expenses - Schedule of Supplementary Unaudited Information About Annual Percentage Payout of Incurred Losses and ALAE, Net of Reinsurance (Detail)
Dec. 31, 2018
U.S. Operations [Member] | Excess and Surplus Lines [Member] | Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 7.80%
Year 2 19.20%
Year 3 19.00%
Year 4 17.10%
Year 5 11.50%
Year 6 7.90%
Year 7 5.30%
Year 8 3.50%
U.S. Operations [Member] | Specialty Admitted [Member] | Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 14.60%
Year 2 21.60%
Year 3 18.30%
Year 4 16.00%
Year 5 9.10%
Year 6 6.10%
Year 7 4.00%
Year 8 2.70%
U.S. Operations [Member] | Specialty Admitted [Member] | Professional [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 7.20%
Year 2 24.50%
Year 3 29.60%
Year 4 19.80%
Year 5 8.40%
Year 6 4.10%
Year 7 2.20%
Year 8 1.30%
U.S. Operations [Member] | Specialty Admitted [Member] | Specialty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 40.50%
Year 2 30.60%
Year 3 11.90%
Year 4 8.30%
Year 5 4.20%
Year 6 2.20%
Year 7 1.10%
Year 8 0.60%
International Operations [Member] | Reinsurance Division [Member] | Property [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.20%
Year 2 33.70%
Year 3 13.80%
Year 4 12.90%
Year 5 6.10%
Year 6 4.00%
Year 7 2.60%
Year 8 1.80%
International Operations [Member] | Bermuda Insurance [Member] | Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 1.30%
Year 2 8.60%
Year 3 17.80%
Year 4 21.90%
Year 5 16.60%
Year 6 10.10%
Year 7 6.80%
Year 8 4.60%
International Operations [Member] | Syndicate 1200 [Member] | Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.30%
Year 2 7.20%
Year 3 9.40%
Year 4 12.70%
Year 5 14.60%
Year 6 12.30%
Year 7 10.90%
Year 8 8.60%
Year 9 6.40%
International Operations [Member] | Syndicate 1200 [Member] | Professional [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.70%
Year 2 10.40%
Year 3 14.50%
Year 4 14.80%
Year 5 11.30%
Year 6 10.50%
Year 7 8.10%
Year 8 6.80%
Year 9 5.20%
International Operations [Member] | Syndicate 1200 [Member] | Property [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 39.50%
Year 2 28.00%
Year 3 16.00%
Year 4 9.80%
Year 5 3.00%
Year 6 1.70%
Year 7 0.90%
Year 8 0.50%
Year 9 0.30%
International Operations [Member] | Syndicate 1200 [Member] | Specialty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 38.90%
Year 2 29.20%
Year 3 15.60%
Year 4 9.60%
Year 5 3.70%
Year 6 1.70%
Year 7 0.80%
Year 8 0.30%
Year 9 0.20%