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Income Taxes Impact of New Tax Legislation (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Impact of AMT Repeal on Current Taxes | $ 29,581

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- Definition Impact of AMT Repeal on Current Taxes + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration