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v2.4.1.9

Loans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate On Term Loan | 4.68%ambc_InterestRateOnTermLoan | 4.62%ambc_InterestRateOnTermLoan
Loan Maturity Date | Jun. 30, 2026 |
Loans, Unpaid principal balance | $ 6,936 ambc_LoansUnpaidPrincipalBalance | $ 7,734 ambc_LoansUnpaidPrincipalBalance

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- Definition Interest Rate On Term Loan + References No definition available. + Details
Name: | ambc_InterestRateOnTermLoan
Namespace Prefix: | ambc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan Maturity date + References No definition available. + Details
Name: | ambc_LoanMaturityDate
Namespace Prefix: | ambc_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition This represents the amount of principal outstanding on loans receivable that are presented on the balance sheet at fair value, whether such presentation is as a separate caption or parenthetical disclosure. + References No definition available. + Details
Name: | ambc_LoansUnpaidPrincipalBalance
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration