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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Reorganization Costs [Table Text Block] | Reorganization items: Professional advisory fees and other costs directly associated with our reorganization are reported separately as reorganization items pursuant to the Reorganizations Topic of the ASC. Reorganization items also include adjustments to reflect the carrying value of certain pre-petition liabilities at their allowable claim amounts, gain on the settlement of liabilities subject to compromise and fresh start reporting adjustments. The reorganization items in the Consolidated Statements of Total Comprehensive Income (Loss) consisted of the following items:
| Successor Ambac |  |  | Predecessor Ambac
|  |  | Period from May 1 |  |  | Period from January 1 |  |
| Year Ended |  | through |  |  | through |  | Year Ended
| December 31, 2014 |  | December 31, 2013 |  |  | April 30, 2013 |  | December 31, 2012
U.S. Trustee fees | $ | 7 |  |  | $ | 33 |  |  |  | $ | 23 |  |  | $ | 50 |
Professional fees | 204 |  |  | 460 |  |  |  | 4,483 |  |  | 7,165 |
Gain from cancellation and satisfaction of Predecessor Ambac debt | — |  |  | — |  |  |  | (1,521,435 | ) |  | — |
Fresh start reporting adjustments | — |  |  | — |  |  |  | (1,228,251 | ) |  | — |
Total reorganization items | $ | 211 |  |  | $ | 493 |  |  |  | $ | (2,745,180 | ) |  | $ | 7,215 |
Summary of Activity in Goodwill for Financial Guarantee Reporting Unit | The following is a summary of activity in goodwill for the Financial Guarantee reporting unit:
| Successor Ambac |  |  | Predecessor Ambac
|  |  | Period from May 1 |  |  | Period from January 1 |  |
| Year Ended |  | through |  |  | through |  | Year Ended
| December 31, 2014 |  | December 31, 2013 |  |  | April 30, 2013 |  | December 31, 2012
Beginning balance | $ | 514,511 |  |  | $ | — |  |  |  | $ | — |  |  | $ | — |
Goodwill recorded in connection with emergence from Chapter 11 | — |  |  | 514,511 |  |  |  | — |  |  | — |
Accumulated impairment loss | — |  |  | — |  |  |  | — |  |  | — |
Ending balance | $ | 514,511 |  |  | $ | 514,511 |  |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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