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Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate On Term Loan |  | 4.53%
Loan Maturity Date | Jun. 30, 2026 |
Loans, Unpaid principal balance | $ 20,184 | $ 4,873
Minimum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate On Term Loan | 0.00% |
Maximum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate On Term Loan | 4.58% |
Loan Maturity Date | Dec. 15, 2046 |

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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

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- 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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- Definition Line items represent financial 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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |