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Financial Guarantee Insurance Contracts - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Unpaid Losses And Loss Expenses [Line Items]    
Net change in loss reserves $ (256,049) $ 1,671,734
Total net loss expense reserves 136,790 86,171
Total loss expenses 83,226 26,384
Reinsurance recoveries of losses included in loss and loss expenses 6,996 42,508
Loss reserves ceded to reinsurers 147,409 153,480
Subrogation recoveries 2,523,225 2,720,266
Subrogation recoveries, net of reinsurance 2,497,233 2,692,414
Assumed par outstanding amount to reinsurers 235,471  
Deferred ceded premiums and reinsurance recoverables on losses 326,365  
Ceded reinsurance payables 94,527  
Letters of credit 302,692  
Ceded Principal Oustanding of cedant's largest reinsurer as a percentage of cedant's Gross Outstanding Principal 7.70%  
Aggregate amount of insured par ceded to reinsurers 21,396,732  
Amount of gross par outstanding by reinsurer $ 18,779,685