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Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Sep. 30, 2013 Successor Ambac [Member]
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Goodwill [Line Items] |  |
Goodwill |  | $ 514,511
Intangible assets at fair value | $ 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
Name: | us-gaap_GoodwillLineItems
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=29642632&loc=d3e56426-112766 Reference 2: 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
Name: | us-gaap_PostconfirmationGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant