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Fresh Start Financial Statement Reporting - Fresh Start Reorganized Condensed Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2013
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Fresh-Start Adjustment [Line Items] |  |  |
Common stock, shares issued | 45,005,932 us-gaap_CommonStockSharesIssued | 45,003,461 us-gaap_CommonStockSharesIssued | 45,000,000 us-gaap_CommonStockSharesIssued
Number of warrants issued |  |  | 5,047,138 ambc_ClassOfWarrantIssued
Pre-tax gain on extinguishment of obligations |  |  | $ 1,521,435 ambc_PretaxGainOnExtinguishmentOfObligations
Reorganization Item Adjustments [Member] |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Cash |  |  | (101,900)us-gaap_Cash / us-gaap_StatementScenarioAxis = ambc_ReorganizationItemAdjustmentsMember
Successor [Member] |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Cash |  |  | $ 152,951 us-gaap_Cash / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Common stock, shares issued |  |  | 45,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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