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Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Parenthetical) (Detail) | 8 Months Ended | 12 Months Ended | 4 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] Transactions | Dec. 31, 2012 Predecessor Ambac [Member] Transactions | Apr. 30, 2013 Predecessor Ambac [Member] Adverse Samples [Member] Transactions
Summary Of Rollforward Of Subrogation By Estimation Approach [Line Items] |  |  |
Number of transactions added to the Adverse Sample subrogation population |  |  | 2
Number of transactions removed from Adverse Sample subrogation population | 2 | 2 |

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- Definition Number of transaction removed from the Adverse Sample subrogation population. + References No definition available. + Details
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- Definition Number of transaction added to the Adverse Sample subrogation population. + References No definition available. + Details
Name: | ambc_NumberOfTransactionsAddedToAdverseSampleSubrogationPopulation
Namespace Prefix: | ambc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | ambc_
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Balance Type: | na
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