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Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Successor Ambac [Member] | Mar. 31, 2014 Successor Ambac [Member] Unaffiliated Customers [Member] | Mar. 31, 2013 Predecessor Ambac [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Unaffiliated Customers [Member] | Mar. 31, 2014 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] | Mar. 31, 2014 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Mar. 31, 2014 Operating Segments [Member] Successor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Mar. 31, 2014 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] | Mar. 31, 2014 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Mar. 31, 2014 Operating Segments [Member] Successor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Mar. 31, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] | Mar. 31, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Unaffiliated Customers [Member] | Mar. 31, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Guarantee [Member] Inter-Segment [Member] | Mar. 31, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] | Mar. 31, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Unaffiliated Customers [Member] | Mar. 31, 2013 Operating Segments [Member] Predecessor Ambac [Member] Financial Services [Member] Inter-Segment [Member] | Mar. 31, 2014 Corporate and Other [Member] Successor Ambac [Member] | Mar. 31, 2014 Corporate and Other [Member] Successor Ambac [Member] Unaffiliated Customers [Member] | Mar. 31, 2014 Corporate and Other [Member] Successor Ambac [Member] Inter-Segment [Member] | Mar. 31, 2013 Corporate and Other [Member] Predecessor Ambac [Member] | Mar. 31, 2013 Corporate and Other [Member] Predecessor Ambac [Member] Unaffiliated Customers [Member] | Mar. 31, 2013 Corporate and Other [Member] Predecessor Ambac [Member] Inter-Segment [Member] | Mar. 31, 2014 Inter-segment Eliminations [Member] Successor Ambac [Member] | Mar. 31, 2014 Inter-segment Eliminations [Member] Successor Ambac [Member] Inter-Segment [Member] | Mar. 31, 2013 Inter-segment Eliminations [Member] Predecessor Ambac [Member] | Mar. 31, 2013 Inter-segment Eliminations [Member] Predecessor Ambac [Member] Inter-Segment [Member]
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | $ 109,138 | $ 109,138 | $ 290,872 | $ 290,872 | $ 162,928 | $ 162,553 | $ 375 | $ (53,513) | $ (53,438) | $ (75) | $ 250,964 | $ 250,238 | $ 726 | $ 39,921 | $ 40,605 | $ (684) | $ 8,658 | $ 23 | $ 8,635 | $ 29 | $ 29 |  | $ (8,935) | $ (8,935) | $ (42) | $ (42)
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations |  |  | 159,298 | 159,298 | 282,909 | 282,909 | 207,104 | 216,261 | (9,157) | (54,983) | (54,529) | (454) | 246,628 | 246,700 | (72) | 37,998 | 38,847 | (849) | 7,177 | (2,434) | 9,611 | (1,717) | (2,638) | 921 |  |  |  |
Total assets | 27,114,248 | 27,092,477 | 27,114,248 |  | 26,154,094 |  | 26,535,119 |  |  | 534,256 |  |  | 25,563,432 |  |  | 558,593 |  |  | 44,873 |  |  | 32,069 |  |  |  |  |  |
Net investment income |  |  | 70,801 |  | 84,514 |  | 70,384 |  |  | 394 |  |  | 83,274 |  |  | 1,211 |  |  | 23 |  |  | 29 |  |  |  |  |  |
Insurance intangible amortization |  |  | 31,714 |  | 0 |  | 31,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | 32,328 |  | 23,165 |  | 31,881 |  |  | 447 |  |  | 22,176 |  |  | 989 |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items |  |  | $ 23 |  | $ 2,059 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  |  | $ 2,059 |  |  |  |  |  |

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