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Commitments and Contingencies - Additional Information (Detail) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified | Apr. 30, 2013
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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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Balance Type: | na
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- 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 + Details
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