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Losses and Loss Expense Reserve (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Summary of loss reserve roll-forward, net of subrogation recoverable and reinsurance    
Beginning balance of net loss reserves, net of subrogation recoverable and reinsurance $ 6,230,780 $ 4,424,450
Current year:    
Establishment of new loss reserves, gross of subrogation and net of reinsurance 147,712 503,697
Claim payments, net of subrogation and reinsurance (2,968) (2,442)
Establishment of subrogation recoveries, net of reinsurance    (9,761)
Total current year 144,744 491,494
Prior year:    
Change in previously established loss reserves, gross of subrogation and net of reinsurance 662,809 1,683,831
Change in previously established subrogation recoveries, net of reinsurance (64,420) (324,151)
Claim recoveries (payments), net of subrogation recoverable and reinsurance 28,705 (179,440)
Total prior year 627,094 1,180,240
Changes in loss reserves 771,838 1,671,734
Net deconsolidation of certain VIEs    134,596
Ending loss reserves, net of subrogation recoverable and reinsurance $ 7,002,618 $ 6,230,780