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v2.4.1.9

Income Taxes Income Taxes - Effective Tax Rates Differing From Prevailing Federal Corporate Income Tax Rates (Details) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 Rate | Dec. 31, 2013 Rate | Apr. 30, 2013 Rate | Dec. 31, 2012 Rate
Successor [Member] |  |  |  |  |
Reconciliation of Effective Tax Rates [Line Items] |  |  |  |  |
Tax on income from continuing operations at statutory rate | $ 179,311 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 172,639 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Tax on income from continuing operations at statutory rate,tax rate |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Reorganization Income | 0 ambc_IncomeTaxReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_IncomeTaxReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Reorganization Income, tax rate |  | 0.00%ambc_EffectiveIncomeTaxRateReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0.00%ambc_EffectiveIncomeTaxRateReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Tax bankruptcy adjustments | 0 ambc_IncomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_IncomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Tax bankruptcy adjustments, tax rate |  | 0.00%ambc_EffectiveincomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0.00%ambc_EffectiveincomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
IRS settlement | 0 us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
IRS settlement, tax rate |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Tax-exempt interest | (11,988)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (6,811)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Tax-exempt interest, tax rate |  | (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Valuation allowance | (160,064)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (159,661)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Valuation allowance, tax rate |  | (32.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (31.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Foreign taxes | 0 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 3,472 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Foreign taxes, tax rate |  | 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Other, net | 255 us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (82)us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Other, net, tax rate |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Provision for income taxes | 7,514 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 9,557 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 1.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Predecessor [Member] |  |  |  |  |
Reconciliation of Effective Tax Rates [Line Items] |  |  |  |  |
Tax on income from continuing operations at statutory rate |  |  |  | 1,171,812 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (89,777)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Tax on income from continuing operations at statutory rate,tax rate |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Reorganization Income |  |  |  | (712,581)ambc_IncomeTaxReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_IncomeTaxReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Reorganization Income, tax rate |  |  |  | (21.30%)ambc_EffectiveIncomeTaxRateReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0.00%ambc_EffectiveIncomeTaxRateReconciliationReorganizationIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Tax bankruptcy adjustments |  |  |  | 285,734 ambc_IncomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_IncomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Tax bankruptcy adjustments, tax rate |  |  |  | 8.50%ambc_EffectiveincomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0.00%ambc_EffectiveincomeTaxReconciliationTaxBankruptcyAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
IRS settlement |  |  |  | 370,996 us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
IRS settlement, tax rate |  |  |  | 11.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Tax-exempt interest |  |  |  | (4,996)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (17,795)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Tax-exempt interest, tax rate |  |  |  | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 6.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Valuation allowance |  |  |  | (1,110,230)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 107,502 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Valuation allowance, tax rate |  |  |  | (33.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (41.90%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Foreign taxes |  |  |  | 0 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_IncomeTaxReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Foreign taxes, tax rate |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other, net |  |  |  | 20 us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 2,919 us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other, net, tax rate |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Provision for income taxes |  |  |  | $ 755 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 2,849 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (1.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in foreign income tax contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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