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Background and Business Description AMPS Exchange (Details) $ in Thousands | Aug. 03, 2018 USD ($) $ / shares shares
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AMPS Liquidation Preference Value Per Share | $ / shares | $ 25,000
AMPS Exchange Surplus Notes Issued Per Share | $ / shares | $ 13,875
AMPS Exchange Shares Tendered | shares | 22,096
AMPS Exchange Cash Paid Per Share | $ / shares | $ 500
AMPS Exchange Warrants Issued Per Share | $ / shares | $ 37.3076
AMPS Exchange Percent Acquired | 0.844
AMPS Exchange Shares Acquired | shares | 22,296
AMPS Exchange Aggregated Liquidation Preference | $ 557,000
AMPS Exchange Nominal Discount | 227,000
AMPS Exchange Nominal Discount at Fair Value | 253,000
AMPS Exchange Total Surplus Notes Issued | 213,000
AMPS Exchange Interest Included in Surplus Notes Issued | $ 98,000
AMPS Exchange Total Warrants Issued | 824,307
AFG [Member] |
AMPS Exchange Aggregated Liquidation Preference | $ 35,000

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- Definition AMPS Exchange Aggregated Liquidation Preference + References No definition available. + Details
Name: | ambc_AMPSExchangeAggregatedLiquidationPreference
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AMPS Exchange Cash Paid Per Share + References No definition available. + Details
Name: | ambc_AMPSExchangeCashPaidPerShare
Namespace Prefix: | ambc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Exchange Interest Included in Surplus Notes Issued + References No definition available. + Details
Name: | ambc_AMPSExchangeInterestIncludedinSurplusNotesIssued
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AMPS Exchange Nominal Discount + References No definition available. + Details
Name: | ambc_AMPSExchangeNominalDiscount
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AMPS Exchange Nominal Discount at Fair Value + References No definition available. + Details
Name: | ambc_AMPSExchangeNominalDiscountatFairValue
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AMPS Exchange Percent Acquired + References No definition available. + Details
Name: | ambc_AMPSExchangePercentAcquired
Namespace Prefix: | ambc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Exchange Shares Acquired + References No definition available. + Details
Name: | ambc_AMPSExchangeSharesAcquired
Namespace Prefix: | ambc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Exchange Shares Tendered + References No definition available. + Details
Name: | ambc_AMPSExchangeSharesTendered
Namespace Prefix: | ambc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Exchange Surplus Notes Issued Per Share + References No definition available. + Details
Name: | ambc_AMPSExchangeSurplusNotesIssuedPerShare
Namespace Prefix: | ambc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Exchange Total Surplus Notes Issued + References No definition available. + Details
Name: | ambc_AMPSExchangeTotalSurplusNotesIssued
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AMPS Exchange Total Warrants Issued + References No definition available. + Details
Name: | ambc_AMPSExchangeTotalWarrantsIssued
Namespace Prefix: | ambc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Exchange Warrants Issued Per Share + References No definition available. + Details
Name: | ambc_AMPSExchangeWarrantsIssuedPerShare
Namespace Prefix: | ambc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition AMPS Liquidation Preference Value Per Share + References No definition available. + Details
Name: | ambc_AMPSLiquidationPreferenceValuePerShare
Namespace Prefix: | ambc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=ambc_AfgMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |