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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2012
Major Jurisdictions | The following are the major jurisdictions in which Ambac and its affiliates operate and the earliest tax years subject to examination:
Jurisdiction |  | Tax Year |
United States |  |  | 2005 |
New York State |  |  | 2008 |
New York City |  |  | 2011 |
United Kingdom |  |  | 2006 |
Italy |  |  | 2007 |

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- Definition Schedule of tax years subject to examination by major jurisdictions. + References No definition available. + Details
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Namespace Prefix: | abk_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration