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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 | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended
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Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] Variable Interest Entity [Member] | Sep. 30, 2013 Successor Ambac [Member] Variable Interest Entity [Member] | Sep. 30, 2013 Successor Ambac [Member] Financial Services Derivatives Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Financial Services Derivatives Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Sep. 30, 2013 Successor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Sep. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2013 Successor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2013 Successor Ambac [Member] Currency Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Currency Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Other Derivatives [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Other Derivatives [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2013 Successor Ambac [Member] Call Options on Long-Term Debt [Member] Other Income [Member] | Sep. 30, 2013 Successor Ambac [Member] Call Options on Long-Term Debt [Member] Other Income [Member] | Sep. 30, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Sep. 30, 2012 Predecessor Ambac [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Financial Services Derivatives Products [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Financial Services Derivatives Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Financial Services Derivatives Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Credit Derivatives [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Currency Swaps [Member] Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Currency Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Currency Swaps [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Futures Contracts [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Other Derivatives [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Other Derivatives [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Other Derivatives [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Call Options on Long-Term Debt [Member] Other Income [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ (13,855) | $ 556,812 | $ (57,421) | $ 378,313 | $ 12,372 | $ 96,085 | $ 31,194 | $ 82,414 | $ (63,421) | $ 374,203 | $ 13,299 | $ 87,468 | $ 6,000 | $ 4,110 |  |  | $ (961) | $ 8,870 | $ 34 | $ (253) |  |  | $ (5,709) | $ (297,855) | $ 26,473 | $ 2,858 | $ (203,736) | $ 26,101 | $ (36,007) | $ (33,735) | $ (113,141) | $ 27,440 | $ (60,384) | $ 12,803 | $ (2,723) | $ (203,620) | $ 42,514 | $ (33,036) | $ (30,622) | $ (99,026) | $ 5,581 | $ (116) | $ (16,413) | $ 570 | $ 807 | $ (3,485) | $ (3,133) | $ (15,247) | $ (56) | $ 20 | $ 325 | $ 100,710

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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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