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Schedule II - Reorganization Items (Detail) (USD $) In Thousands, unless otherwise specified | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2014 | Apr. 30, 2013 | Mar. 31, 2013 | Apr. 30, 2013 | Dec. 31, 2012
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Trustee fees |  |  |  |  |  |  |  | $ 33 ambc_DebtorReorganizationItemsUsTrusteeFees / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 7 ambc_DebtorReorganizationItemsUsTrusteeFees / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Professional fees |  |  |  |  |  |  |  | 460 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 204 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Gain from cancellation and satisfaction of Predecessor Ambac debt |  |  |  |  |  |  |  | 0 us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Fresh start reporting adjustments |  |  |  |  |  |  |  | 0 ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total reorganization items | 424 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 186 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 65 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 4 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 493 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 211 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
ambc_DebtorReorganizationItemsFreshStartAdjustments |  |  |  |  |  |  |  | 0 ambc_Ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_Ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Trustee fees |  |  |  |  |  |  |  |  |  |  |  | 23 ambc_DebtorReorganizationItemsUsTrusteeFees / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 50 ambc_DebtorReorganizationItemsUsTrusteeFees / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Professional fees |  |  |  |  |  |  |  |  |  |  |  | 4,483 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,165 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Gain from cancellation and satisfaction of Predecessor Ambac debt |  |  |  |  |  |  |  |  |  |  |  | (1,521,435)us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Fresh start reporting adjustments |  |  |  |  |  |  |  |  |  |  |  | (1,228,251)ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total reorganization items |  |  |  |  |  |  |  |  |  | (2,747,239)us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 2,059 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (2,745,180)us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,215 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
ambc_DebtorReorganizationItemsFreshStartAdjustments |  |  |  |  |  |  |  |  |  |  |  | (1,228,251)ambc_Ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_Ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ambac Financial Group, Inc Parent Company Only [Member] | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total reorganization items |  |  |  |  |  |  |  | 493 us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 211 us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Ambac Financial Group, Inc Parent Company Only [Member] | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total reorganization items |  |  |  |  |  |  |  |  |  |  |  | $ (2,745,180)us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 7,215 us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X
- Definition Impact of the fresh start adjustments on Predecessor's Consolidated Statements of Total Comprehensive Income. + References No definition available. + Details
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- Definition Impact of the fresh start adjustments on Predecessor's Consolidated Statements of Total Comprehensive Income + References No definition available. + Details
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X
- Definition Amount of reorganization items related to US Trustee fees related to entities in bankruptcy. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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X
- Definition Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764 + Details
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- Definition Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764 + Details
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- Definition Total amount of reorganization items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764 + Details
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