XML 111 R146.htm IDEA: XBRL DOCUMENT v2.4.1.9

Schedule IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	8 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013 Rate	Dec. 31, 2014 Rate	Apr. 30, 2013 Rate	Dec. 31, 2012 Rate
Successor [Member]
Condensed Financial Statements, Captions [Line Items]
Direct Premiums Written	$ (80,309)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	$ (288,310)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Ceded Premiums Written	(7,810)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	(6,842)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Assumed Premiums Written	0us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	0us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Premiums Written, Net	(72,499)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	(281,468)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Percentage of Amount Assumed to Net	0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Predecessor [Member]
Condensed Financial Statements, Captions [Line Items]
Direct Premiums Written			(14,125)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	(277,508)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ceded Premiums Written			(1,098)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	(23,371)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Assumed Premiums Written			0us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Premiums Written, Net			$ (13,027)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ (254,137)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Percentage of Amount Assumed to Net			0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X

- Definition

Premiums Written Financial Guarantee Insurance Contracts Percentage Of Amount Assumed To Net

+ References

No definition available.

+ Details

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Namespace Prefix:	ambc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b)(2),(c)(2)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of written premiums ceded to other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)(2)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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Balance Type:	debit
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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)(1)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

Name:	us-gaap_DirectPremiumsWritten
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

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Namespace Prefix:
Data Type:	na
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