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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Successor Ambac [Member] | Successor Ambac [Member] Retained Earnings/Accumulated Deficit [Member] | Successor Ambac [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Successor Ambac [Member] Preferred Stock [Member] | Successor Ambac [Member] Common Stock [Member] | Successor Ambac [Member] Paid-in Capital [Member] | Successor Ambac [Member] Common Stock Held in Treasury, at Cost [Member] | Successor Ambac [Member] Noncontrolling Interest [Member] | Predecessor Ambac [Member] | Predecessor Ambac [Member] Retained Earnings/Accumulated Deficit [Member] | Predecessor Ambac [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Predecessor Ambac [Member] Preferred Stock [Member] | Predecessor Ambac [Member] Common Stock [Member] | Predecessor Ambac [Member] Paid-in Capital [Member] | Predecessor Ambac [Member] Common Stock Held in Treasury, at Cost [Member] | Predecessor Ambac [Member] Noncontrolling Interest [Member]
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Beginning balance at Dec. 31, 2011 |  |  |  |  |  |  |  |  | $ (3,149,533) | $ (6,039,922) | $ 463,259 |  | $ 3,080 | $ 2,172,027 | $ (411,419) | $ 663,442
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | (337,980) | (400,254) | 64,710 |  |  |  |  | (2,436)
Stock-based compensation |  |  |  |  |  |  |  |  | (664) | (664) |  |  |  |  |  |
Shares issued under equity plans |  |  |  |  |  |  |  |  | 664 |  |  |  |  |  | 664 |
Ending balance at Sep. 30, 2012 |  |  |  |  |  |  |  |  | (3,487,513) | (6,440,840) | 527,969 |  | 3,080 | 2,172,027 | (410,755) | 661,006
Beginning balance at Jun. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 267,866 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2012 |  |  |  |  |  |  |  |  | (3,487,513) |  |  |  | 3,080 | 2,172,027 |  |
Beginning balance at Dec. 31, 2012 |  |  |  |  |  |  |  |  | (3,246,967) | (6,297,264) | 625,385 |  | 3,080 | 2,172,027 | (410,755) | 660,560
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 3,522,382 | 3,349,049 | 174,875 |  |  |  |  | (1,542)
Stock-based compensation |  |  |  |  |  |  |  |  | (60) | (60) |  |  |  |  |  |
Shares issued under equity plans |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  | 60 |
Elimination of Predecessor Ambac Shareholder equity accounts and noncontrolling interest adjustment |  |  |  |  |  |  |  |  |  | 2,948,275 | (800,260) |  | (3,080) | (2,172,027) | 410,695 | (383,603)
Ending balance at Apr. 30, 2013 | 460,415 |  |  |  | 450 | 184,550 |  | 275,415 | 275,415 |  |  |  |  |  |  | 275,415
Issuance of new equity in connection with emergence from Chapter 11 | 185,000 |  |  |  | 450 | 184,550 |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 426,319 | 436,656 | (10,246) |  |  |  |  | (91) |  |  |  |  |  |  |  |
Warrants exercised | 16 |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2013 | 886,750 | 436,656 | (10,246) |  | 450 | 184,566 |  | 275,324 |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of new equity in connection with emergence from Chapter 11 | 185,000 |  |  |  | 450 |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 324,682 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2013 | $ 886,750 |  |  |  | $ 450 |  |  |  |  |  |  |  |  |  |  |

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