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v2.4.1.9

Net Income Per Share - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 110,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Number of new common stock issued | 45,006,057 us-gaap_CommonStockSharesIssued | 45,005,932 us-gaap_CommonStockSharesIssued |
Par value of common stock issued | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 5,047,138 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Exercise price of common stock |  |  | $ 16.67 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Investment Warrants Expiration Date |  | Apr. 30, 2023 |
Warrant exercised | 125 ambc_WarrantExercisedDuringPeriodShares |  |
Common stock shares issued | 125 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |
Warrants outstanding | 5,039,752 ambc_WarrantsOutstanding |  |
Successor [Member] |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |
Number of new common stock issued |  |  | 45,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 5,047,138 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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