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Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
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Jun. 30, 2013 Successor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Jun. 30, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Jun. 30, 2012 Predecessor Ambac [Member] | Jun. 30, 2013 Financial Guarantee [Member] Successor Ambac [Member] | Apr. 30, 2013 Financial Guarantee [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Financial Guarantee [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Financial Guarantee [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Financial Guarantee [Member] Predecessor Ambac [Member] | Jun. 30, 2013 Financial Services [Member] Successor Ambac [Member] | Apr. 30, 2013 Financial Services [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Financial Services [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Financial Services [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Financial Services [Member] Predecessor Ambac [Member] | Jun. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] | Apr. 30, 2013 Corporate and Other [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Corporate and Other [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] | Jun. 30, 2013 Inter-Segment Eliminations [Member] Successor Ambac [Member] | Apr. 30, 2013 Inter-Segment Eliminations [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Inter-Segment Eliminations [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Inter-Segment Eliminations [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Inter-Segment Eliminations [Member] Predecessor Ambac [Member]
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaffiliated customers | $ 242,785 | $ 349,701 | $ (5,961) | $ 641,128 | $ 318,175 | $ 160,275 | $ 382,957 | $ 87,665 | $ 633,750 | $ 357,492 | $ 82,490 | $ (33,266) | $ (93,682) | $ 7,339 | $ (39,430) | $ 20 | $ 10 | $ 56 | $ 39 | $ 113 |  |  |  |  |
Inter-segment |  |  |  |  |  | 399 | 214 | 1,397 | 940 | 2,896 | (374) | (198) | (1,346) | (882) | (2,789) | 5,425 | 197,055 |  | 197,055 | 645 | (5,450) | (197,071) | (51) | (197,113) | (752)
Total revenues before expenses and reorganization items | 242,785 | 349,701 | (5,961) | 641,128 | 318,175 | 160,674 | 383,171 | 89,062 | 634,690 | 360,388 | 82,116 | (33,464) | (95,028) | 6,457 | (42,219) | 5,445 | 197,065 | 56 | 197,094 | 758 | (5,450) | (197,071) | (51) | (197,113) | (752)
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaffiliated customers | 205,795 | 3,065,124 | (813,561) | 3,348,033 | (559,939) | 124,890 | 1,583,465 | (717,187) | 1,830,165 | (510,900) | 81,692 | (35,614) | (96,257) | 3,233 | (44,587) | (787) | 1,517,273 | (117) | 1,514,635 | (4,452) |  |  |  |  |
Inter-segment |  |  |  |  |  | (5,497) | (197,115) | (712) | (197,187) | 315 | (523) | (252) | (429) | (1,101) | (1,784) | 6,020 | 197,367 | 1,141 | 198,288 | 1,469 |  |  |  |  |
Pre-tax income (loss) from continuing operations | 205,795 | 3,065,124 | (813,561) | 3,348,033 | (559,939) | 119,393 | 1,386,350 | (717,899) | 1,632,978 | (510,585) | 81,169 | (35,866) | (96,686) | 2,132 | (46,371) | 5,233 | 1,714,640 | 1,024 | 1,712,923 | (2,983) |  |  |  |  |
Total assets | 27,475,367 | 28,853,435 | 26,611,791 | 28,853,435 | 26,611,791 | 26,934,044 | 28,287,321 | 25,771,887 | 28,287,321 | 25,771,887 | 486,346 | 536,711 | 800,677 | 536,711 | 800,677 | 54,977 | 29,403 | 39,227 | 29,403 | 39,227 |  |  |  |  |
Net investment income | 26,566 | 32,411 | 93,836 | 117,480 | 205,953 | 26,385 | 32,040 | 89,953 | 115,869 | 195,214 | 158 | 361 | 3,826 | 1,572 | 10,625 | 23 | 10 | 57 | 39 | 114 |  |  |  |  |
Insurance intangible amortization | 24,952 |  |  |  |  | 24,952 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 21,144 | 7,860 | 31,855 | 31,025 | 65,694 | 20,776 | 7,542 | 30,205 | 29,718 | 62,254 | 368 | 318 | 1,650 | 1,307 | 3,440 |  |  |  |  |  |  |  |  |  |
Reorganization items | $ 424 | $ (2,747,239) | $ 767 | $ (2,745,180) | $ 3,228 |  | $ (1,231,550) |  | $ (1,231,550) |  |  | $ 1,505 |  | $ 1,505 |  | $ 424 | $ (1,517,194) | $ 767 | $ (1,515,135) | $ 3,228 |  |  |  |  |

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