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Basis of Presentation and Significant Accounting Policies - Summary of Liabilities Subject to Compromise (Parenthetical) (Detail) (Predecessor Ambac [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Predecessor Ambac [Member]
Reorganization Items [Line Items]
Litigation settlement amount	$ 14,007

X

- Details

Name:	ambc_ReorganizationItemsLineItems
Namespace Prefix:	ambc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration