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Segment Information - Schedule of Gross Premiums Written, Net Premiums Earned and Net Change in Fair Value of Credit Derivatives (Detail) (Successor [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Gross Premiums Written | $ 1,062 us-gaap_PremiumsWrittenGross | $ (5,766)us-gaap_PremiumsWrittenGross
Net premiums earned | 65,718 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts | 82,547 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts
Net Change In Fair Value Of Credit Derivatives | (2,499)us-gaap_GainLossOnDerivativeInstrumentsNetPretax | 7,382 us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Reportable Geographical Components [Member] | United States [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Premiums Written | (2,366)us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (699)us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net premiums earned | 52,739 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 56,758 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net Change In Fair Value Of Credit Derivatives | 3,958 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 6,581 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Reportable Geographical Components [Member] | United Kingdom [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Premiums Written | 9,174 us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (6,166)us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net premiums earned | 7,582 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 20,635 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net Change In Fair Value Of Credit Derivatives | 0 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Reportable Geographical Components [Member] | Other International [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Premiums Written | (5,746)us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,099 us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net premiums earned | 5,397 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 5,154 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net Change In Fair Value Of Credit Derivatives | $ (6,457)us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 801 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 + Details
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Period Type: | duration

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of financial guarantee premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6933001&loc=SL5747862-161289 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6816-158387 + Details
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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Details
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