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Employment Benefit Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 4 Months Ended | 12 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | $ 333 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 4,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  | 3,676,693 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Predecessor [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock or Unit Option Plan Expense | 0 us-gaap_StockOptionPlanExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_StockOptionPlanExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Restricted Stock or Unit Expense | 0 us-gaap_RestrictedStockExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_RestrictedStockExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
ambc_PerformanceStockExpense | 0 ambc_Ambc_PerformanceStockExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_Ambc_PerformanceStockExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Allocated Share-based Compensation Expense | (60)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (664)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Stock Based Compensation | 0 ambc_StockBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_StockBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
StockBasedCompensationNetofTax | 0 ambc_StockBasedCompensationNetofTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_StockBasedCompensationNetofTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Unvested Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_StatementScenarioAxis = ambc_UnvestedStockOptionsMember
Successor [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Performance Awards Number |  |  | 0 ambc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformanceAwardsNumber / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 35,412 ambc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformanceAwardsNumber / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Stock or Unit Option Plan Expense |  |  | 56 us-gaap_StockOptionPlanExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 444 us-gaap_StockOptionPlanExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Restricted Stock or Unit Expense |  |  | 1,050 us-gaap_RestrictedStockExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2,816 us-gaap_RestrictedStockExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
ambc_PerformanceStockExpense |  |  | 0 ambc_Ambc_PerformanceStockExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 190 ambc_Ambc_PerformanceStockExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Allocated Share-based Compensation Expense |  |  | 1,106 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 3,450 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Allocated Share-based Compensation Expense, Net of Tax |  |  | $ 1,106 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 3,450 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Performance Awards Number + References No definition available. + Details
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- Definition All amounts related to share-based compensation plans. Includes the value of stock issued during the period as a result of any share-based compensation plans and the amount of share-based compensation recognized in the statement of operations. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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