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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2012
Predecessor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | $ 625,385 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ending Balance | 800,260 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 625,385 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Successor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 11,661 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Other comprehensive income before reclassifications | 187,555 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (32,070)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 242,400 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amounts reclassified from accumulated other comprehensive income | (12,680)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 43,731 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (33,778)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Elimination Of Predecessor Shareholder Equity And Noncontrolling Interest | (800,260)ambc_EliminationOfPredecessorShareholderEquityAndNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Net current period other comprehensive income | (625,385)ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 11,661 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 208,622 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Ending Balance | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 11,661 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 220,283 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Predecessor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 651,272 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ending Balance |  |  |  | 651,272 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Successor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (41,910)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Other comprehensive income before reclassifications | 188,212 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (85,641)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 285,565 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amounts reclassified from accumulated other comprehensive income | (12,865)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 43,731 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (32,962)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Elimination Of Predecessor Shareholder Equity And Noncontrolling Interest | (826,619)ambc_EliminationOfPredecessorShareholderEquityAndNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Net current period other comprehensive income | (651,272)ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (41,910)ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 252,603 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Ending Balance |  | (41,910)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 210,693 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Other Postretirement Benefit Plan, Defined Benefit [Member] | Predecessor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | (5,860)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ending Balance |  |  |  | (5,860)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other Postretirement Benefit Plan, Defined Benefit [Member] | Successor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 10,847 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Other comprehensive income before reclassifications | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 10,847 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amounts reclassified from accumulated other comprehensive income | 185 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (816)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Elimination Of Predecessor Shareholder Equity And Noncontrolling Interest | 5,675 ambc_EliminationOfPredecessorShareholderEquityAndNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Net current period other comprehensive income | 5,860 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 10,847 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (816)ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Ending Balance |  | 10,847 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 10,031 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Accumulated Translation Adjustment [Member] | Predecessor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | (20,027)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ending Balance |  |  |  | (20,027)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Accumulated Translation Adjustment [Member] | Successor [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 42,724 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Other comprehensive income before reclassifications | (657)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 42,724 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (43,165)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amounts reclassified from accumulated other comprehensive income | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Elimination Of Predecessor Shareholder Equity And Noncontrolling Interest | 20,684 ambc_EliminationOfPredecessorShareholderEquityAndNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Net current period other comprehensive income | 20,027 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 42,724 ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (43,165)ambc_OtherComprehensiveIncomeLossExcludingNoncontrollingInterestNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Ending Balance |  | $ 42,724 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ (441)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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