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Average Historical Loss and LAE Duration, Net of Reinsurance (Detail)
Dec. 31, 2021
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 28.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 40.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 16.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 6.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 2.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 1.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 0.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 0.90%
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 1.20%
Reinsurance Segment | Casualty & Specialty | 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 4.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 9.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 13.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 15.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 13.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 10.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 7.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 4.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Nine 3.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Ten 3.60%
Reinsurance Segment | Casualty & Specialty | 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 33.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 28.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 13.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 7.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 4.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 2.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 1.60%
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 0.70%
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 34.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 13.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 6.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 3.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 2.50%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 0.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 0.60%
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 1.30%
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 14.40%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 17.80%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 17.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 13.00%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 10.70%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 6.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 5.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 3.60%
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 1.90%
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 19.10%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Two 21.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Three 15.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Four 13.30%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Five 8.20%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Six 4.60%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Seven 1.90%
Average Annual Percentage Payout of Loss and LAE Incurred, Net of Reinsurance Year Eight 1.10%
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 0.70%