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Fresh Start Financial Statement Reporting - Schedule of Impact of Fresh Start Adjustments (Parenthetical) (Detail) | 1 Months Ended
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Apr. 30, 2013
Fresh-Start Adjustment [Line Items] |
Coupon rate | 5.01%ambc_FairValueInputsCouponRate
Loans (Non-VIE) [Member] |
Fresh-Start Adjustment [Line Items] |
Principal-weighted average life | 6 years 9 months 22 days
Discount rate | 9.71%us-gaap_FairValueInputsDiscountRate / invest_InvestmentAxis = ambc_NonVariableInterestEntitiesLoansMember
VIE Loans and Long-Term Debt [Member] |
Fresh-Start Adjustment [Line Items] |
Discount rate | 5.70%us-gaap_FairValueInputsDiscountRate / invest_InvestmentAxis = ambc_VariableInterestEntityLoansAndLongTermDebtMember
Obligations Under Investment Agreements [Member] |
Fresh-Start Adjustment [Line Items] |
Discount rate | 9.40%us-gaap_FairValueInputsDiscountRate / invest_InvestmentAxis = ambc_InvestmentAgreementObligationsMember
Surplus Notes [Member] |
Fresh-Start Adjustment [Line Items] |
Discount rate | 10.60%us-gaap_FairValueInputsDiscountRate / invest_InvestmentAxis = ambc_SurplusNotesMember
Junior Surplus Notes [Member] |
Fresh-Start Adjustment [Line Items] |
Discount rate | 16.60%us-gaap_FairValueInputsDiscountRate / invest_InvestmentAxis = ambc_JuniorSurplusNotesMember

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- Definition Fair value inputs coupon rate. + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value inputs maturity. + References No definition available. + Details
Name: | ambc_FairValueInputsMaturity
Namespace Prefix: | ambc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentAxis=ambc_JuniorSurplusNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentAxis=ambc_NonVariableInterestEntitiesLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentAxis=ambc_SurplusNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentAxis=ambc_VariableInterestEntityLoansAndLongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |