XML 77 R65.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Fair Value of Securities Placed in Trust | $ 381,249 | $ 396,100
Successor [Member] | Cash and Securities Pledged Directly from Investment Portfolio [Member] |  |
Investment [Line Items] |  |
Fair Value of Cash and Underlying Securities | 368,086 | 338,007
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties | 108,367 | 108,379
Fair Value of Cash and Securities Pledged to Derivative Counterparties | $ 259,719 | $ 229,628

X
- 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
- Definition Fair Value of Securities Placed in Trust + References No definition available. + Details
Name: | ambc_FairValueofSecuritiesPlacedinTrust
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_SuccessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ambc_InvestmentPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |