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Financial Guarantees in Force - Summary of International Finance Guaranteed Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding $ 179,092,000 $ 223,633,000
Successor Ambac [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 179,092,000  
Successor Ambac [Member] | International Finance [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 31,618,000  
Successor Ambac [Member] | International Finance [Member] | United Kingdom [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 21,282,000  
Successor Ambac [Member] | International Finance [Member] | Australia [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 3,331,000  
Successor Ambac [Member] | International Finance [Member] | Italy [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 2,412,000  
Successor Ambac [Member] | International Finance [Member] | Austria [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 967,000  
Successor Ambac [Member] | International Finance [Member] | New Zealand [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 526,000  
Successor Ambac [Member] | International Finance [Member] | Internationally Diversified [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 1,918,000  
Successor Ambac [Member] | International Finance [Member] | Other International [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 1,182,000  
Predecessor Ambac [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   223,633,000
Predecessor Ambac [Member] | International Finance [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   38,256,000
Predecessor Ambac [Member] | International Finance [Member] | United Kingdom [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   22,585,000
Predecessor Ambac [Member] | International Finance [Member] | Australia [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   4,820,000
Predecessor Ambac [Member] | International Finance [Member] | Italy [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   3,068,000
Predecessor Ambac [Member] | International Finance [Member] | Austria [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   943,000
Predecessor Ambac [Member] | International Finance [Member] | New Zealand [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   529,000
Predecessor Ambac [Member] | International Finance [Member] | Internationally Diversified [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   3,968,000
Predecessor Ambac [Member] | International Finance [Member] | Other International [Member]
   
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding   $ 2,343,000