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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Beginning balance of loss and loss expense reserves, net of subrogation recoverable and reinsurance $ 6,230,780 $ 4,424,450
Current year:    
Establishment of new loss and loss expense reserves, gross of subrogation and net of reinsurance 464,058 503,697
Paid claims and loss expenses, net of subrogation and reinsurance (20,765) (2,442)
Establishment of subrogation recoveries, net of reinsurance   (9,761)
Total current year 443,293 491,494
Prior years:    
Change in previously established loss and loss expense reserves, gross of subrogation and net of reinsurance 72,700 1,683,831
Paid claims and loss expenses, net of subrogation and reinsurance (944,860) (179,440)
Change in previously established subrogation recoveries, net of reinsurance 172,818 (324,151)
Total prior years (699,342) 1,180,240
Net change in loss and loss expense reserves (256,049) 1,671,734
Net deconsolidation of VIEs   134,596
Ending loss and loss expense reserves, net of subrogation recoverable and reinsurance $ 5,974,731 $ 6,230,780