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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 Successor Ambac [Member] | Apr. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] Variable Interest Entities [Member] | Sep. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] | Sep. 30, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] Variable Interest Entities [Member] | Sep. 30, 2013 Successor Ambac [Member] Futures Contracts [Member] | Sep. 30, 2013 Successor Ambac [Member] Credit Derivatives [Member] | Sep. 30, 2013 Successor Ambac [Member] Other Contracts [Member] | Sep. 30, 2013 Successor Ambac [Member] Currency Swaps [Member] Variable Interest Entities [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Variable Interest Entities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Interest Rate Swaps [Member] Variable Interest Entities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Futures Contracts [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Credit Derivatives [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Other Contracts [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Currency Swaps [Member] Variable Interest Entities [Member]
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Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 141,139 |  |  | $ 141,139 |  |  |  |  |  |  | $ 199,370 |  | $ 198,117 |  | $ 1,253 |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 458,559 |  | 2,047,204 | 253,728 | 1,960,732 | 2,023 | 202,653 | 155 | 86,472 |  | 604,579 | 2,221,781 | 390,774 | 2,131,315 |  | 213,585 | 220 | 90,466
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 58,177 |  |  | 58,177 |  |  |  |  |  |  | 73,264 |  | 73,264 |  |  |  |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 58,177 |  |  | 58,177 |  |  |  |  |  |  | 73,264 |  | 73,264 |  |  |  |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 82,962 | 121,643 |  | 82,962 |  |  |  |  |  | 121,643 | 126,106 |  | 124,853 |  | 1,253 |  |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 400,382 | 621,645 | 2,047,204 | 195,551 | 1,960,732 | 2,023 | 202,653 | 155 | 86,472 | 621,645 | 531,315 | 2,221,781 | 317,510 | 2,131,315 |  | 213,585 | 220 | 90,466
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 | 71,536 |  |  | 69,513 |  | 2,023 |  |  |  |  | 180,113 |  | 180,113 |  |  |  |  |
Net Amount, Derivative Assets | 82,962 |  |  | 82,962 |  |  |  |  |  |  | 126,106 |  | 124,853 |  | 1,253 |  |  |
Net Amount, Derivative Liabilities | $ 328,846 |  | $ 2,047,204 | $ 126,038 | $ 1,960,732 |  | $ 202,653 | $ 155 | $ 86,472 |  | $ 351,202 | $ 2,221,781 | $ 137,397 | $ 2,131,315 |  | $ 213,585 | $ 220 | $ 90,466

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