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Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) (Successor Ambac [Member]) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
European ABS Transactions [Member] |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Coupon rate | 0.59% | 0.72%
Maturity | 21 years 4 months 1 day | 17 years 9 months 40 days
Yield | 9.22% | 8.02%
US Commercial ABS Transaction [Member] |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Coupon rate | 5.88% | 6.11%
Maturity | 15 years 4 months 27 days | 6 years 9 months 28 days
Yield | 9.50% | 11.95%

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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: | instant

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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