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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 Successor Ambac [Member] | Mar. 31, 2014 Successor Ambac [Member] Variable Interest Entity [Member] | Mar. 31, 2014 Successor Ambac [Member] Financial Services Derivatives Products [Member] | Mar. 31, 2014 Successor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Mar. 31, 2014 Successor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Mar. 31, 2014 Successor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Mar. 31, 2014 Successor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Mar. 31, 2014 Successor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Mar. 31, 2014 Successor Ambac [Member] Other Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Mar. 31, 2013 Predecessor Ambac [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Variable Interest Entity [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Financial Services Derivatives Products [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Other Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ (118,843) | $ (72,384) | $ (53,841) | $ 7,382 | $ (77,792) | $ (51,860) | $ 5,408 | $ (1,992) | $ 11 | $ (83,626) | $ (95,844) | $ (569) | $ 12,787 | $ (100,548) | $ (1,022) | $ 4,704 | $ 455 | $ (2)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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