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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | $ 91,320 | $ 77,711
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 348,427 | 253,898
Successor Ambac [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 141,427 | 134,587
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 398,534 | 310,774
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 50,107 | 56,876
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 50,107 | 56,876
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 91,320 | 77,711
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 348,427 | 253,898
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 | 690
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 110,646 | 42,555
Net Amount, Derivative Assets | 91,320 | 77,021
Net Amount, Derivative Liabilities | 237,781 | 211,343
Successor Ambac [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,955,291 | 1,772,306
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,955,291 | 1,772,306
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 | 0
Net Amount, Derivative Liabilities | 1,955,291 | 1,772,306
Successor Ambac [Member] | Interest Rate Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 139,266 | 132,250
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 314,515 | 216,287
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 50,107 | 56,876
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 50,107 | 56,876
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 89,159 | 75,374
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 264,408 | 159,411
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 110,646 | 42,555
Net Amount, Derivative Assets | 89,159 | 75,374
Net Amount, Derivative Liabilities | 153,762 | 116,856
Successor Ambac [Member] | Interest Rate Swaps [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,885,244 | 1,680,834
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,885,244 | 1,680,834
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | 1,885,244 | 1,680,834
Successor Ambac [Member] | Futures Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 1,109 | 2,337
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 1,109 | 2,337
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 0 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  | 690
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 |
Net Amount, Derivative Assets | 1,109 | 1,647
Net Amount, Derivative Liabilities | 0 |
Successor Ambac [Member] | Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 1,052 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 83,882 | 94,322
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 1,052 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 83,882 | 94,322
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Assets | 1,052 |
Net Amount, Derivative Liabilities | 83,882 | 94,322
Successor Ambac [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 137 | 165
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 137 | 165
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | 137 | 165
Successor Ambac [Member] | Currency Swaps [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 70,047 | 91,472
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 70,047 | 91,472
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | $ 70,047 | $ 91,472

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