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Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] | Jun. 30, 2013 Successor Ambac [Member] Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member] | Jun. 30, 2013 AFS [Member] Successor Ambac [Member] Interest Rate Swaps [Member] | Jun. 30, 2013 AFS [Member] Successor Ambac [Member] Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member] | Jun. 30, 2013 AFS [Member] Successor Ambac [Member] Interest Rate Swaps-Basis Swaps [Member] | Jun. 30, 2013 AFS [Member] Successor Ambac [Member] Futures Contracts [Member] | Jun. 30, 2013 AFS [Member] Successor Ambac [Member] Other derivatives [Member] | Dec. 31, 2012 AFS [Member] Predecessor Ambac [Member] Interest Rate Swaps [Member] | Dec. 31, 2012 AFS [Member] Predecessor Ambac [Member] Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member] | Dec. 31, 2012 AFS [Member] Predecessor Ambac [Member] Interest Rate Swaps-Basis Swaps [Member] | Dec. 31, 2012 AFS [Member] Predecessor Ambac [Member] Futures Contracts [Member] | Dec. 31, 2012 AFS [Member] Predecessor Ambac [Member] Other derivatives [Member]
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Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative products, Notional Amount | $ 1,669,298 | $ 4,356,549 | $ 1,782,999 | $ 4,707,454 | $ 703,384 | $ 1,571,088 | $ 161,690 | $ 100,000 | $ 75,650 | $ 727,926 | $ 1,657,382 | $ 161,690 | $ 161,500 | $ 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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