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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) (Successor Ambac [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Cash and Securities Pledged Directly from Investment Portfolio [Member] |  |
Investment [Line Items] |  |
Fair Value of Cash and Underlying Securities | $ 330,681 | $ 500,986
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties | 158,040 | 371,723
Fair Value of Cash and Securities Pledged to Derivative Counterparties | 172,641 | 129,263
Cash and Securities Pledged from Its Derivative Counterparties [Member] |  |
Investment [Line Items] |  |
Fair Value of Cash and Underlying Securities |  | 690
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties |  |
Fair Value of Cash and Securities Pledged to Derivative Counterparties |  |

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

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

X
- Definition Total fair value of cash and underlying securities pledged. + References No definition available. + Details
Name: | ambc_FairValueOfCashAndUnderlyingSecurities
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration