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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 Successor Ambac [Member] | Apr. 30, 2013 Successor Ambac [Member] | Dec. 31, 2013 Successor Ambac [Member] Variable Interest Entities [Member] | Dec. 31, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] | Dec. 31, 2013 Successor Ambac [Member] Interest Rate Swaps [Member] Variable Interest Entities [Member] | Dec. 31, 2013 Successor Ambac [Member] Futures Contracts [Member] | Dec. 31, 2013 Successor Ambac [Member] Credit Derivatives [Member] | Dec. 31, 2013 Successor Ambac [Member] Other Contracts [Member] | Dec. 31, 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 | $ 134,587 |  |  | $ 132,250 |  | $ 2,337 |  |  |  |  | $ 199,370 |  | $ 198,117 |  | $ 1,253 |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 310,774 |  | 1,772,306 | 216,287 | 1,680,834 |  | 94,322 | 165 | 91,472 |  | 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 | 56,876 |  |  | 56,876 |  |  |  |  |  |  | 73,264 |  | 73,264 |  |  |  |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 56,876 |  |  | 56,876 |  |  |  |  |  |  | 73,264 |  | 73,264 |  |  |  |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 77,711 | 121,643 |  | 75,374 |  | 2,337 |  |  |  | 121,643 | 126,106 |  | 124,853 |  | 1,253 |  |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 253,898 | 621,645 | 1,772,306 | 159,411 | 1,680,834 |  | 94,322 | 165 | 91,472 | 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 | 690 |  |  |  |  | 690 |  |  |  |  |  |  |  |  |  |  |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 42,555 |  |  | 42,555 |  |  |  |  |  |  | 180,113 |  | 180,113 |  |  |  |  |
Net Amount, Derivative Assets | 77,021 |  |  | 75,374 |  | 1,647 |  |  |  |  | 126,106 |  | 124,853 |  | 1,253 |  |  |
Net Amount, Derivative Liabilities | $ 211,343 |  | $ 1,722,306 | $ 116,856 | $ 1,680,834 |  | $ 94,322 | $ 165 | $ 91,472 |  | $ 351,202 | $ 2,221,781 | $ 137,397 | $ 2,131,315 |  | $ 213,585 | $ 220 | $ 90,466

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