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Obligations Under Investment Agreements Obligations Under Investment Agreements - Principal Due Under Investment Agreements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | $ 161,451 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
2015 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 48,928 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal / ambc_OptionalDrawDateAxis = ambc_A2015Member
2016 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 5,263 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal / ambc_OptionalDrawDateAxis = ambc_A2016Member
2017 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 107,260 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal / ambc_OptionalDrawDateAxis = ambc_A2017Member
2018 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 0 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal / ambc_OptionalDrawDateAxis = ambc_A2018Member
2019 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 0 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal / ambc_OptionalDrawDateAxis = ambc_A2019Member
All Later Years [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | $ 0 ambc_InvestmentAgreementExpectedRepaymentsofPrincipal / ambc_OptionalDrawDateAxis = ambc_AllLaterYearsMember

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- Definition Amount of investment agreement principal due to be paid based on the expected optional draw date. + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ambc_OptionalDrawDateAxis=ambc_AllLaterYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |