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Fresh Start Financial Statement Reporting - Schedule of Reconciliation of Enterprise Value to Reorganization Value, and Determination of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013
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Reorganizations [Abstract] |
Enterprise value | $ 185,000 ambc_PlanOfReorganizationEnterpriseValue
Add: Fair value of liabilities | 28,393,020 us-gaap_Liabilities
Add: Fair value of noncontrolling interest | 275,415 us-gaap_MinorityInterest
Total assets | 28,853,435 us-gaap_Assets
Less: Fair value of identified tangible and intangible assets | 28,338,924 ambc_FairValueOfIdentifiedTangibleAndIntangibleAssets
Reorganization value in excess of fair value of assets (goodwill) | $ 514,511 us-gaap_Goodwill

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