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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 [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 [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) |  |  |  |  |  |  |  |  | (605,846) | (557,798) | (45,666) |  |  |  |  | (2,382)
Stock-based compensation |  |  |  |  |  |  |  |  | (664) | (664) |  |  |  |  |  |
Shares issued under equity plans |  |  |  |  |  |  |  |  | 664 |  |  |  |  |  | 664 |
Ending balance at Jun. 30, 2012 |  |  |  |  |  |  |  |  | (3,755,379) | (6,598,384) | 417,593 |  | 3,080 | 2,172,027 | (410,755) | 661,060
Beginning balance at Mar. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | (841,737) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2012 |  |  |  |  |  |  |  |  | (3,755,379) |  |  |  | 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 |  |  |  |  |  |  |  |  | (800,260) | 2,948,275 | (800,260) |  | (3,080) | (2,172,027) | 410,695 | (383,603)
Ending balance at Apr. 30, 2013 |  |  |  |  | 450 |  |  |  | 275,415 |  |  |  |  |  |  | 275,415
Beginning balance at Mar. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 3,145,485 |  |  |  |  |  |  |
Elimination of Predecessor Ambac Shareholder equity accounts and noncontrolling interest adjustment |  |  |  |  |  |  |  |  | (800,260) |  |  |  |  |  |  |
Ending balance at Apr. 30, 2013 | 460,415 |  |  |  | 450 | 184,550 |  | 275,415 | 275,415 |  |  |  |  |  |  |
Issuance of new equity in connection with emergence from Chapter 11 | 185,000 |  |  |  | 450 | 184,550 |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 101,637 | 205,681 | (103,507) |  |  |  |  | (537) |  |  |  |  |  |  |  |
Warrants exercised | 15 |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2013 | $ 562,067 | $ 205,681 | $ (103,507) |  | $ 450 | $ 184,565 |  | $ 274,878 |  |  |  |  |  |  |  |

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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591552-111686 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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