XML 43 R27.htm IDEA: XBRL DOCUMENT
v3.20.2

Background and Business Description - Additional Information (Details) | 9 Months Ended
--- | ---
Sep. 30, 2020
Background And Basis Of Presentation [Line Items] |
Entity Incorporation, Date of Incorporation | Apr. 29, 1991

X
- Definition Background And Basis Of Presentation [Line Items] + References No definition available. + Details
Name: | ambc_BackgroundAndBasisOfPresentationLineItems
Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when an entity was incorporated + References No definition available. + Details
Name: | dei_EntityIncorporationDateOfIncorporation
Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration