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Financial Guarantee Insurance Contracts - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 8 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Successor Ambac [Member]
Apr. 30, 2013
Successor Ambac [Member]
Dec. 31, 2013
Successor Ambac [Member]
Insurance Intangible Asset [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Dec. 31, 2013
Loss Reserves [Member]
Dec. 31, 2012
Loss Reserves [Member]
Insurance [Line Items]                  
Total net loss expense reserves $ 110,551 $ 136,790              
Reinsurance recoveries of losses included in losses and loss expenses     (14,106)     3,889 6,996    
Weighted average risk-free rate to discount loss reserve               3.20% 1.60%
Losses and loss expense reserves ceded to reinsurers 122,357 147,409              
Subrogation recoveries 2,206,598 2,523,225              
Subrogation recoveries, net of reinsurance 2,183,652 2,497,233              
Assumed par outstanding amount to reinsurers 248,225                
Deferred ceded premiums and reinsurance recoverables on losses 266,278                
Ceded reinsurance payables 85,424                
Letters of credit 153,129                
Aggregate amount of insured par ceded to reinsurers 18,598,367                
Amount of gross par outstanding by reinsurer 16,617,069                
Ceded Principal Outstanding of cedant's largest reinsurer as a percentage of cedant's Gross Outstanding Principal 8.40%                
Intangible amortization expense     99,658   99,658        
Insurance intangible asset     1,597,965 1,658,972 1,597,965         
Accumulated amortization on insurance intangible asset         $ 100,767