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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 | 8 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] | Dec. 31, 2013 Successor Ambac [Member] Variable Interest Entity [Member] | Dec. 31, 2013 Successor Ambac [Member] Financial Services Derivatives Products [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Variable Interest Entity [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Financial Services Derivatives Products [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Financial Services Derivatives Products [Member] | Dec. 31, 2013 Credit Derivatives [Member] Successor Ambac [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Apr. 30, 2013 Credit Derivatives [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Dec. 31, 2012 Credit Derivatives [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Net Change in Fair Value of Credit Derivatives [Member] | Dec. 31, 2013 Interest Rate Swaps [Member] Successor Ambac [Member] (Loss) Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Dec. 31, 2013 Interest Rate Swaps [Member] Successor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Interest Rate Swaps [Member] Predecessor Ambac [Member] (Loss) Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Dec. 31, 2012 Interest Rate Swaps [Member] Predecessor Ambac [Member] (Loss) Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Interest Rate Swaps [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2012 Interest Rate Swaps [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2013 Currency Swaps [Member] Successor Ambac [Member] (Loss) Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Dec. 31, 2013 Currency Swaps [Member] Successor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Currency Swaps [Member] Predecessor Ambac [Member] (Loss) Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Dec. 31, 2012 Currency Swaps [Member] Predecessor Ambac [Member] (Loss) Income on Variable Interest Entities [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Currency Swaps [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2012 Currency Swaps [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2013 Futures Contracts [Member] Successor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Futures Contracts [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2012 Futures Contracts [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2013 Other Derivatives [Member] Successor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Apr. 30, 2013 Other Derivatives [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2012 Other Derivatives [Member] Predecessor Ambac [Member] Financial Services Derivatives Products [Member] Derivative Products [Member] | Dec. 31, 2013 Call Options on Long-Term Debt [Member] Successor Ambac [Member] Other Income [Member] | Apr. 30, 2013 Call Options on Long-Term Debt [Member] Predecessor Ambac [Member] Other Income [Member] | Dec. 31, 2012 Call Options on Long-Term Debt [Member] Predecessor Ambac [Member] Other Income [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ 802,462 | $ 494,822 | $ 114,771 | $ (297,855) | $ (168,242) | $ (203,736) | $ (134,729) | $ (33,735) | $ (125,004) | $ 192,869 | $ (60,384) | $ (9,219) | $ 495,712 | $ 104,114 | $ (203,620) | $ (107,341) | $ (30,622) | $ (111,396) | $ (890) |  | $ (116) | $ (27,388) |  | $ 807 | $ 10,925 | $ (3,133) | $ (14,864) | $ (268) | $ 20 | $ 449 |  |  | $ 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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