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Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified |  | 3 Months Ended | 5 Months Ended |  | 3 Months Ended | 5 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended
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Apr. 30, 2013 | Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] | Apr. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Successor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Sep. 30, 2012 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Unaffiliated Customers [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2012 Predecessor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Sep. 30, 2013 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] | Sep. 30, 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] Unaffiliated Customers [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] | Sep. 30, 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] Unaffiliated Customers [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Apr. 30, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Sep. 30, 2012 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Sep. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] | Sep. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] | Sep. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2013 Corporate and Other [Member] Successor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Corporate and Other [Member] Predecessor Ambac [Member] | Sep. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] | Sep. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] Unaffiliated Customers [Member] | Apr. 30, 2013 Corporate and Other [Member] Predecessor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] Unaffiliated Customers [Member] | Sep. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Apr. 30, 2013 Corporate and Other [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2012 Corporate and Other [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] | Sep. 30, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] | Sep. 30, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2013 Inter-segment Eliminations [Member] Successor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Inter-segment Eliminations [Member] Predecessor Ambac [Member] | Sep. 30, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] | Sep. 30, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Apr. 30, 2013 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Sep. 30, 2012 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Inter-Segment [Member]
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  | $ 171,652 | $ 414,067 |  | $ 171,652 | $ 414,067 | $ 197,162 | $ 640,388 | $ 515,337 |  | $ 197,162 | $ 640,388 | $ 515,337 | $ 157,894 | $ 318,198 | $ 157,382 | $ 317,287 | $ 512 | $ 911 | $ 13,672 | $ 95,788 | $ 14,144 | $ 96,634 | $ (472) | $ (846) | $ 231,258 | $ 633,950 | $ 591,646 | $ 230,014 | $ 633,010 | $ 587,506 | $ 1,244 | $ 940 | $ 4,140 | $ (34,218) | $ 6,457 | $ (76,437) | $ (33,021) | $ 7,339 | $ (72,451) | $ (1,197) | $ (882) | $ (3,986) | $ 8,385 | $ 13,830 | $ 126 | $ 146 | $ 8,259 | $ 13,684 | $ 169 | $ 197,094 | $ 927 | $ 169 | $ 39 | $ 282 |  | $ 197,055 | $ 645 | $ (8,299) | $ (13,749) | $ (8,299) | $ (13,749) | $ (47) | $ (197,113) | $ (799) | $ (47) | $ (197,113) | $ (799)
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations |  | 231,601 | 437,396 |  | 231,601 | 437,396 | 158,040 | 3,348,033 | (401,899) |  | 158,040 | 3,348,033 | (401,899) | 210,342 | 329,735 | 219,006 | 343,896 | (8,664) | (14,161) | 12,189 | 93,358 | 12,812 | 94,504 | (623) | (1,146) | 198,832 | 1,632,978 | (311,753) | 196,302 | 1,830,165 | (314,598) | 2,530 | (197,187) | 2,845 | (37,331) | 2,132 | (83,702) | (35,434) | 3,233 | (80,021) | (1,897) | (1,101) | (3,681) | 9,070 | 14,303 | (217) | (1,004) | 9,287 | 15,307 | (3,461) | 1,712,923 | (6,444) | (2,828) | 1,514,635 | (7,280) | (633) | 198,288 | 836 |  |  |  |  |  |  |  |  |  |
Total assets | 28,853,435 | 28,633,638 | 28,633,638 | 28,853,435 |  |  | 26,947,892 | 28,853,435 | 26,947,892 | 27,085,265 |  |  |  | 28,117,113 | 28,117,113 |  |  |  |  | 477,111 | 477,111 |  |  |  |  | 26,206,822 | 28,287,321 | 26,206,822 |  |  |  |  |  |  | 703,945 | 536,711 | 703,945 |  |  |  |  |  |  | 39,414 | 39,414 |  |  |  |  | 37,125 | 29,403 | 37,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | 52,126 | 78,322 |  |  |  | 84,078 | 116,740 | 290,031 |  |  |  |  | 51,637 | 77,652 |  |  |  |  | 474 | 632 |  |  |  |  | 81,037 | 115,129 | 276,251 |  |  |  |  |  |  | 2,986 | 1,572 | 13,611 |  |  |  |  |  |  | 15 | 38 |  |  |  |  | 55 | 39 | 169 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance intangible amortization |  | 37,473 | 62,425 |  |  |  |  |  |  |  |  |  |  | 37,473 | 62,425 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | 31,817 | 52,961 |  |  |  | 23,268 | 31,025 | 88,962 |  |  |  |  | 31,281 | 52,057 |  |  |  |  | 536 | 904 |  |  |  |  | 21,712 | 29,718 | 83,966 |  |  |  |  |  |  | 1,556 | 1,307 | 4,996 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items |  | $ 4 | $ 428 |  |  |  | $ 1,252 | $ (2,745,180) | $ 4,480 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,231,550) |  |  |  |  |  |  |  |  | $ 1,505 |  |  |  |  |  |  |  | $ 4 | $ 428 |  |  |  |  | $ 1,252 | $ (1,515,135) | $ 4,480 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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