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Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified |  | 8 Months Ended |  | 8 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 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 | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 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 | 4 Months Ended | 12 Months Ended
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Apr. 30, 2013 | Dec. 31, 2013 Successor Ambac [Member] | Apr. 30, 2013 Successor Ambac [Member] | Dec. 31, 2013 Successor Ambac [Member] Unaffiliated Customers [Member] | Dec. 31, 2013 Successor Ambac [Member] Inter-Segment [Member] | Dec. 31, 2013 Successor Ambac [Member] Corporate and Other [Member] | Dec. 31, 2013 Successor Ambac [Member] Corporate and Other [Member] Unaffiliated Customers [Member] | Dec. 31, 2013 Successor Ambac [Member] Corporate and Other [Member] Inter-Segment [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Unaffiliated Customers [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Unaffiliated Customers [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Inter-Segment [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Corporate and Other [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Corporate and Other [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Corporate and Other [Member] Unaffiliated Customers [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Corporate and Other [Member] Unaffiliated Customers [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Corporate and Other [Member] Inter-Segment [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Corporate and Other [Member] Inter-Segment [Member] | Dec. 31, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] | Dec. 31, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Dec. 31, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Dec. 31, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] | Dec. 31, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Dec. 31, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] | Dec. 31, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Dec. 31, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Dec. 31, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] | Dec. 31, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Dec. 31, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Dec. 31, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Dec. 31, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] | Dec. 31, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] Unaffiliated Customers [Member] | Dec. 31, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] Inter-Segment [Member] | Apr. 30, 2013 Inter-segment Eliminations [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Unaffiliated Customers [Member] | Apr. 30, 2013 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Dec. 31, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Inter-Segment [Member]
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  | $ 581,048 |  | $ 581,048 |  | $ 22,296 | $ 170 | $ 22,126 | $ 640,388 | $ 685,689 | $ 640,388 | $ 685,689 |  | $ 197,094 | $ 980 | $ 39 | $ 335 | $ 197,055 | $ 645 | $ 466,538 | $ 464,701 | $ 1,837 | $ 114,967 | $ 116,177 | $ (1,210) | $ 633,950 | $ 763,520 | $ 633,010 | $ 758,331 | $ 940 | $ 5,189 | $ 6,457 | $ (77,969) | $ 7,339 | $ (72,977) | $ (882) | $ (4,992) | $ (22,753) |  | $ (22,753) | $ (197,113) | $ (842) |  | $ (197,113) | $ (842)
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations |  | 512,316 |  | 512,316 |  | 21,453 | (3,354) | 24,807 | 3,348,033 | (256,505) | 3,348,033 | (256,505) |  | 1,712,923 | (1,534) | 1,514,635 | (6,729) | 198,288 | 5,195 | 379,488 | 402,651 | (23,163) | 111,375 | 113,019 | (1,644) | 1,632,978 | (166,181) | 1,830,165 | (166,761) | (197,187) | 580 | 2,132 | (88,790) | 3,233 | (83,015) | (1,101) | (5,775) |  |  |  |  |  |  |  |
Total assets | 28,853,435 | 27,106,939 | 28,853,435 |  |  | 36,956 |  |  | 26,969,994 | 27,085,265 |  |  |  | 29,403 | 32,257 |  |  |  |  | 26,597,097 |  |  | 472,886 |  |  | 28,287,321 | 26,519,480 |  |  |  |  | 536,711 | 533,528 |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | 146,446 |  |  |  | 62 |  |  | 116,740 | 382,902 |  |  |  | 39 | 221 |  |  |  |  | 145,269 |  |  | 1,115 |  |  | 115,129 | 365,912 |  |  |  |  | 1,572 | 16,769 |  |  |  |  |  |  |  |  |  |  |  |
Insurance intangible amortization |  | 99,658 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,658 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | 84,950 |  |  |  |  |  |  | 31,025 | 112,320 |  |  |  |  |  |  |  |  |  | 83,595 |  |  | 1,355 |  |  | 29,718 | 105,973 |  |  |  |  | 1,307 | 6,347 |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items |  | $ 493 |  |  |  | $ 493 |  |  | $ (2,745,180) | $ 7,215 |  |  |  | $ (1,515,135) | $ 7,215 |  |  |  |  |  |  |  |  |  |  | $ (1,231,550) |  |  |  |  |  | $ 1,505 |  |  |  |  |  |  |  |  |  |  |  |  |

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