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Fresh Start Financial Statement Reporting - Schedule of Liabilities Subject to Compromise (Parenthetical) (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2013
Reorganizations [Abstract] |
Litigation settlement amount | $ 14,007

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | ambc_LitigationSettlementAmount
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ReorganizationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration