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Commitments and Contingencies - Additional Information (Detail) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified	Apr. 30, 2013
Ambac [Member]
Contingencies And Commitments [Line Items]
Payment to settle the IRS dispute and related proceedings	$ 1,900
Segregated Account [Member]
Contingencies And Commitments [Line Items]
Payment to settle the IRS dispute and related proceedings	$ 100,000

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- Details

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Namespace Prefix:	ambc_
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X

- Definition

Amount of consideration the entity has agreed to pay to settle a legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

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