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Subsequent Events Tier 2 Financing (Details) - Subsequent Event [Member] $ in Thousands | Feb. 12, 2018 USD ($)
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Tier 2 Notes | $ 240,000
Tier 2 Note Security in RMBS Litigation Settlement Proceeds | $ 1,600,000

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- Definition Tier 2 Note Security in RMBS Litigation Settlement Proceeds + References No definition available. + Details
Name: | ambc_Tier2NoteSecurityinRMBSLitigationSettlementProceeds
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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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |