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Average Historical Loss and LAE Duration, Net of Reinsurance (Detail)
Dec. 31, 2017
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 28.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 36.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 17.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 7.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 3.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 2.10%
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 0.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 0.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten (0.50%)
Reinsurance Segment | Casualty & Other | Longer Tailed Lines of Business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 3.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 7.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 11.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 14.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 12.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 11.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 8.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 5.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 4.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 3.10%
Reinsurance Segment | Casualty & Other | Shorter Tailed Lines Of Business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year One 35.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 27.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 13.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 5.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 3.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 2.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 1.80%
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 0.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.50%
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 43.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 31.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 9.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 5.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 3.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 1.70%
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 0.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 0.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.40%
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 3.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 14.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 20.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 14.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 12.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 6.40%
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 5.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 3.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 1.40%
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 24.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 24.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 15.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 13.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 9.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 4.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 2.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 1.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 1.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 0.70%