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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
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Insurance [Abstract]    
Beginning balance of loss and loss expense reserves, net of subrogation recoverable and reinsurance $ 5,974,731 $ 6,230,780
Current year:    
Establishment of new loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance 4,083 464,058
Paid claims and loss expenses, net of subrogation and reinsurance (58) (20,765)
Establishment of RMBS subrogation recoveries, net of reinsurance (188)  
Total current year 3,837 443,293
Prior years:    
Change in previously established loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance (129,090) 72,700
Paid claims and loss expenses, net of subrogation and reinsurance 12,365 (944,860)
Change in previously established RMBS subrogation recoveries, net of reinsurance 34,617 172,818
Total prior years (82,108) (699,342)
Net change in loss and loss expense reserves (78,271) (256,049)
Ending loss and loss expense reserves, net of subrogation recoverable and reinsurance $ 5,896,460 $ 5,974,731