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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
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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

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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