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Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2013 Variable Interest Entity [Member] | Jun. 30, 2013 Successor Ambac [Member]
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill |  |  | $ 514,511
Intangible assets at fair value | $ 164,520 | $ 164,520 |

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- Definition Amount of intangible assets at fair value recorded upon the initial consolidation of a variable interest entity when consolidation occurred during the period(s) reported. + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Amount of goodwill at the balance sheet date after fresh-start adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6585303&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 90-7 -Paragraph 39, 68 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant