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LOSSES AND LOSS EXPENSES (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2006
Dec. 31, 2009
Reinsurance Segment [Member]
Favorable Casualty Development [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Prior Year Net Losses Incurred [Member]
Insurance Segment [Member]
Dec. 31, 2011
Prior Year Net Losses Included Gross Unfavorable Development [Member]
Insurance Segment [Member]
Dec. 31, 2011
Insurance Segment [Member]
Non-Catastrophe Exposures [Member]
Property Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Property Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Property Lines [Member]
Dec. 31, 2009
Insurance Segment [Member]
Property Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Dec. 31, 2009
Insurance Segment [Member]
Dec. 31, 2011
Insurance Segment [Member]
Casualty Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Casualty Lines [Member]
Dec. 31, 2009
Insurance Segment [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Professional Lines [Member]
Dec. 31, 2009
Insurance Segment [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Speciality and Other Lines [Member]
Dec. 31, 2009
Insurance Segment [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
North Americian Risk Management Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Uncollectible Reinsurance Reserve [Member]
Dec. 31, 2011
Insurance Segment [Member]
International Line [Member]
Property Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
International Line [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
International Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Bermuda Property [Member]
Property Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Casualty Lines Gross [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Deepwater Horizon Event, Gross [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Deepwater Horizon Event, Net [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Gross, Excess Casualty IBNR Reserves [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Net, Excess Casualty IBNR Reserves [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Workers Compensation Lines [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
U.S. Middle Market [Member]
Casualty Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Professional Business Line [Member]
Professional Lines [Member]
Dec. 31, 2007
Insurance Segment [Member]
Professional Business Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Better Than Expected Activity [Member]
Professional Lines [Member]
Dec. 31, 2007
Insurance Segment [Member]
Better Than Expected Activity [Member]
Professional Lines [Member]
Dec. 31, 2006
Insurance Segment [Member]
Better Than Expected Activity [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
U.S. Private Commercial Business [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Architects and Engineers Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Architects and Engineers Line [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Miscellaneous Professionals Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Miscellaneous Professionals Line [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Unallocated Adjustment Expenses [Member]
Professional Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Aerospace Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Aerospace Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Specie Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Specie Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Marine Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Marine Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Discontinued Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Catastrophe [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Excess And Surplus Lines [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Programs [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Insurance Segment [Member]
Adverse Development [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Hartford Standard Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Bermuda Errors and Ommissions Line
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Clash Development Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Hartford Private Commercial Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Real Estate Line [Member]
Professional Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Surety Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Environmental Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Financial Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
Equine Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2010
Insurance Segment [Member]
London Market Line [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Catastrophe [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Catastrophe [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Catastrophe [Member]
Short Tailed Lines [Member]
Dec. 31, 2005
Reinsurance Segment [Member]
Catastrophe [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Speciality and Other Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Long Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Other Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
European Windstorms [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
European Windstorms [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Hurricanes Katrina And Rita [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Property Other Lines [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Marine and Aviation Line [Member]
Short Tailed Lines [Member]
Dec. 31, 2008
Reinsurance Segment [Member]
Marine and Aviation Line [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Casualty Lines [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Better Than Expected Activity In North America [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Better Than Expected Activity In Europe [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Enron Settlements [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Enron Settlements [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Hurricane Katrina [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Favorable Property Other Releases [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
U.S. Exposure Releases [Member]
Short Tailed Lines [Member]
Dec. 31, 2005
Reinsurance Segment [Member]
U.S. Exposure Releases [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Reduced U.S. Agricultural Exposures [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Reduced Latin America Exposures [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Reduced Europe and Asia Pacific Exposures [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Better Than Expected Activity [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Better Than Expected Activity [Member]
Long Tailed Lines [Member]
Dec. 31, 2006
Reinsurance Segment [Member]
Better Than Expected Activity [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Favorable Casualty and Professional Development [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Revision of European Loss Development Factors [Member]
Long Tailed Lines [Member]
Dec. 31, 2005
Reinsurance Segment [Member]
Sydney Casualty Exposure Releases [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Italian Hospital Medical Malpractice Exposures [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
European Financial Instituion Exposures [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Favorable Other Lines Development [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Favorable Development of Whole Account Contracts [Member]
Long Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Reinsurance to Close Releases [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Political Risk Loss [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Latin America Suretey Releases [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Contract Commutation [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Favorable European Trade Credit Run Off Exposures Activity [Member]
Long Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Favorable Development [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Favorable Development [Member]
Long Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Lower Than Expected Claim Emergence in Latin America [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Lower Than Expected Claim Emergence in Europe [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Lower Than Expected Claim Emergence in Bermuda [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Lower Than Expected Claim Emergence in US [Member]
Short Tailed Lines [Member]
Dec. 31, 2009
Reinsurance Segment [Member]
Favorable Professional Development [Member]
Long Tailed Lines [Member]
Dec. 31, 2011
Reinsurance Segment [Member]
Increase In Bad Debt Reserve [Member]
Property Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Aerospace Line [Member]
Short Tailed Lines [Member]
Dec. 31, 2010
Reinsurance Segment [Member]
Marine and Aviation Line [Member]
Short Tailed Lines [Member]
Dec. 31, 2011
Asbestos Claims [Member]
Dec. 31, 2011
Environmental Claims [Member]
Dec. 31, 2006
Asbestos and Environmental Claims [Member]
Dec. 31, 2011
Allowance for Reinsurance Recoverable [Member]
Dec. 31, 2010
Allowance for Reinsurance Recoverable [Member]
Increase (Decrease) in Net losses incurred $ 778,600,000 $ 131,100,000                                                                                                                                                                                                                                                                
Percentage of increase (decrease) in current year loss ratio 10.70% 4.20%                                                                                                                                                                                                                                                                
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense, Amount (284,900,000) (372,900,000) (284,700,000)   21,000,000 76,500,000 23,100,000 22,600,000 8,900,000 23,500,000 50,700,000 127,400,000 62,900,000 40,500,000 13,400,000 29,400,000 87,500,000 118,600,000 70,400,000 20,500,000 1,300,000 28,800,000 45,100,000 26,000,000 5,000,000 41,100,000 7,100,000 4,600,000 158,500,000 135,600,000 33,400,000 150,000,000 65,000,000 7,400,000 2,600,000 88,500,000 98,700,000 54,300,000 11,100,000 45,300,000 29,200,000 37,500,000 6,200,000 17,500,000 21,800,000 12,900,000 20,800,000 32,900,000 7,900,000 5,500,000 16,900,000 7,200,000 7,800,000 9,700,000 27,700,000 7,100,000 20,900,000 89,800,000 57,200,000 28,200,000 63,700,000 5,500,000 40,400,000 15,500,000 9,100,000 3,100,000 13,100,000 37,300,000 35,600,000 46,200,000 12,300,000 208,400,000 245,500,000 221,800,000   64,300,000 145,800,000 142,500,000 144,100,000 99,700,000 79,300,000 34,700,000 11,000,000 7,200,000 8,000,000 40,500,000 13,500,000 7,500,000 109,400,000 56,000,000 32,100,000 20,000,000 33,000,000 3,800,000 87,400,000 50,700,000 21,600,000 7,900,000 20,000,000 16,700,000 11,900,000 6,000,000 12,600,000 25,200,000 11,900,000 7,100,000 43,000,000 5,400,000 74,500,000 42,100,000 36,100,000 7,500,000 5,600,000 3,700,000 3,000,000 88,800,000 17,600,000 27,500,000 21,600,000 20,600,000 13,800,000 40,700,000 2,800,000 10,900,000 22,800,000          
Decrease In Bad Debt Reserves                                                                                                                                                     8,300,000                                                                                                              
Restructuring Reserve, Translation Adjustment 130,500,000 125,100,000 287,800,000                                                                                                                                                                                                                                                              
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 3,846,202,000 3,470,509,000 3,875,935,000                                                                                                                                                                                                                                                              
Valuation Allowances and Reserves, Balance                                                                                                                                                                                                                                                                 99,200,000 121,900,000
Workers' Compensation Discount, Percent 5.00%                                                                                                                                                                                                                                                                  
Tabular unpaid losses and loss expenses, net of reinsurance, undiscounted 612,900,000 660,300,000                                                                                                                                                                                                                                                                
Related unpaid losses and loss expenses, discounted 290,300,000 311,900,000                                                                                                                                                                                                                                                                
Asbestos and Environmental losses and loss expenses incurred but not reported net of reinsurance 47,200,000 54,900,000 68,500,000                                                                                                                                                                                                                                                              
Loss Contingency, Pending Claims, Number                                                                                                                                                                                                                                                           1,038 362      
Percentage of open claims due to precautionary claim notices 43.00% 44.00% 50.00%                                                                                                                                                                                                                                                              
Loss Through Portfolio Transfer Contract       40,200,000                                                                                                                                                                                                                                                       18,300,000    
Aggregate Limit on Total Acquired Reserves       $ 60,000,000                                                                                                                                                                                                                                                            
Percentage of total net reserves related to asbestos and environmental exposures 1.00%