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Background and Business Description Tier 2 Notes (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 USD ($)
Tier 2 Notes | $ 240,000
Tier 2 Note Security in RMBS Litigation Settlement Proceeds | $ 1,600,000
Tier 2 Termination Date from Date of Execution of Rehab Exit Support Agreement | 365 days

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- Definition Tier 2 Note Security in RMBS Litigation Settlement Proceeds + 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 Tier 2 Notes + References No definition available. + Details
Name: | ambc_Tier2Notes
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Tier 2 Termination Date from Date of Execution of Rehab Exit Support Agreement + References No definition available. + Details
Name: | ambc_Tier2TerminationDatefromDateofExecutionofRehabExitSupportAgreement
Namespace Prefix: | ambc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration