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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) (Successor [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 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 | $ 379,423 ambc_FairValueOfCashAndUnderlyingSecurities / us-gaap_FinancialInstrumentAxis = ambc_InvestmentPortfolioMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 500,986 ambc_FairValueOfCashAndUnderlyingSecurities / us-gaap_FinancialInstrumentAxis = ambc_InvestmentPortfolioMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties | 156,916 ambc_FairValueOfCashAndSecuritiesPledgedToInvestmentAndRepurchaseAgreementCounterparties / us-gaap_FinancialInstrumentAxis = ambc_InvestmentPortfolioMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 371,723 ambc_FairValueOfCashAndSecuritiesPledgedToInvestmentAndRepurchaseAgreementCounterparties / us-gaap_FinancialInstrumentAxis = ambc_InvestmentPortfolioMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Fair Value of Cash and Securities Pledged to Derivative Counterparties | 222,507 ambc_FairValueOfCashAndSecuritiesPledgedToDerivativeCounterparties / us-gaap_FinancialInstrumentAxis = ambc_InvestmentPortfolioMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 129,263 ambc_FairValueOfCashAndSecuritiesPledgedToDerivativeCounterparties / us-gaap_FinancialInstrumentAxis = ambc_InvestmentPortfolioMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Cash and Securities Pledged from Its Derivative Counterparties [Member] |  |
Investment [Line Items] |  |
Fair Value of Cash and Underlying Securities |  | $ 690 ambc_FairValueOfCashAndUnderlyingSecurities / us-gaap_FinancialInstrumentAxis = ambc_DerivativeCounterpartiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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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
Period Type: | instant

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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
Balance Type: | debit
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- 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

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