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Average Historical Loss and LAE Duration, Net of Reinsurance (Detail)
Dec. 31, 2016
Reinsurance Segment | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 28.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 37.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 16.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 7.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 3.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 1.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 1.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight (0.10%)
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 0.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.00%
Reinsurance Segment | Casualty & Other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 19.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 17.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 11.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 10.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 7.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 6.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 5.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 4.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 3.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 2.00%
Insurance Segment | RSUI | Property Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 40.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 31.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 10.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 6.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 3.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 0.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 0.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 1.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 0.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.20%
Insurance Segment | RSUI | Casualty Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 3.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 13.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 20.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 13.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 12.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 8.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 3.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 3.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 3.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.70%
Insurance Segment | CapSpecialty Incorporated  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 25.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 23.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 16.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 14.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 9.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 5.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 2.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 1.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 1.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.10%
Insurance Segment | Pacific Comp  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 16.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 19.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 16.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 11.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 7.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 7.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 3.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 3.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 2.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 1.80%