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Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 Successor Ambac [Member] European ABS Transactions [Member] | Sep. 30, 2013 Successor Ambac [Member] US Commercial ABS Transaction [Member] | Dec. 31, 2012 Predecessor Ambac [Member] European ABS Transactions [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Coupon rate | 0.72% | 6.02% | 1.64%
Maturity | 18 years | 5 years 7 months 24 days | 12 years 4 months 2 days
Yield | 1.12% | 9.73% | 4.02%

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

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- Details
Name: | us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration