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Financial Guarantees in Force - Summary of International Finance Guaranteed Portfolio (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 144,734,000 us-gaap_ParticipatingPoliciesAmountInForce | $ 179,092,000 us-gaap_ParticipatingPoliciesAmountInForce
International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 24,952,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 31,618,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | United Kingdom [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 17,998,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 21,282,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_GB / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | Australia [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 2,168,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_AU / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 3,331,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_AU / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | Italy [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,415,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_IT / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 2,412,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_IT / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | Austria [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 841,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = ambc_AustriaMember / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 967,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = ambc_AustriaMember / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | New Zealand [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 459,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_NZ / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 526,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = country_NZ / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | Internationally Diversified [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,225,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = ambc_InternationallyDiversifiedMember / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | 1,918,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = ambc_InternationallyDiversifiedMember / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember
International Finance [Member] | Other International [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 846,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember | $ 1,182,000 us-gaap_ParticipatingPoliciesAmountInForce / us-gaap_StatementGeographicalAxis = ambc_OtherInternationalMember / us-gaap_UnderlyingAssetClassAxis = ambc_InternationalFinanceMember

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- Definition The amount as of the balance sheet date of the participating business in force. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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