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v2.4.1.9

Net Income Per Share - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items] |  |  |
Number of new common stock issued | 45,005,932 us-gaap_CommonStockSharesIssued | 45,003,461 us-gaap_CommonStockSharesIssued | 45,000,000 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 | 949 ambc_WarrantExercisedDuringPeriodShares | 6,312 ambc_WarrantExercisedDuringPeriodShares |
Common stock shares issued | 949 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 2,524 us-gaap_StockIssuedDuringPeriodSharesNewIssues |
Warrants outstanding | 5,039,877 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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