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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 Successor Ambac [Member] Cash and Securities Pledged Directly from Investment Portfolio [Member] | Sep. 30, 2013 Successor Ambac [Member] Cash and Securities Pledged from Its Derivative Counterparties [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Cash and Securities Pledged Directly from Investment Portfolio [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Cash and Securities Pledged from Its Derivative Counterparties [Member]
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Investment [Line Items] |  |  |  |
Fair Value of Cash and Underlying Securities | $ 513,285 |  | $ 646,663 |
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties | 373,012 |  | 375,412 |
Fair Value of Cash and Securities Pledged to Derivative Counterparties | $ 140,273 |  | $ 271,251 |

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- Definition Fair value of cash and securities pledged to derivative counterparties. + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair value of cash and securities pledged to investment and repurchase agreement counterparties. + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
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- Definition Total fair value of cash and underlying securities pledged. + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | invest_
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Period Type: | duration