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Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative products, Notional Amount $ 2,776,103 $ 11,281,777
Successor Ambac [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 2,776,103  
Successor Ambac [Member] | Interest Rate Swaps [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 1,818,118  
Successor Ambac [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 3,350,714  
Predecessor Ambac [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   11,281,777
Predecessor Ambac [Member] | Interest Rate Swaps [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   1,782,999
Predecessor Ambac [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   4,707,454
AFS [Member] | Successor Ambac [Member] | Interest Rate Swaps [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 697,837  
AFS [Member] | Successor Ambac [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 1,540,976  
AFS [Member] | Successor Ambac [Member] | Interest Rate Swaps-Basis Swaps [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 146,705  
AFS [Member] | Successor Ambac [Member] | Futures Contracts [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 100,000  
AFS [Member] | Successor Ambac [Member] | Other Derivatives [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount 75,650  
AFS [Member] | Predecessor Ambac [Member] | Interest Rate Swaps [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   727,926
AFS [Member] | Predecessor Ambac [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   1,657,382
AFS [Member] | Predecessor Ambac [Member] | Interest Rate Swaps-Basis Swaps [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   161,690
AFS [Member] | Predecessor Ambac [Member] | Futures Contracts [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   161,500
AFS [Member] | Predecessor Ambac [Member] | Other Derivatives [Member]
    
Derivative [Line Items]    
Derivative products, Notional Amount   $ 75,651