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Schedule IV - Reinsurance (Detail) (USD $) In Thousands, unless otherwise specified	8 Months Ended	4 Months Ended	12 Months Ended	8 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013 Successor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member]	Dec. 31, 2012 Predecessor Ambac [Member]	Dec. 31, 2013 Financial Guarantee Insurance Corporation [Member] Successor Ambac [Member]	Apr. 30, 2013 Financial Guarantee Insurance Corporation [Member] Predecessor Ambac [Member]	Dec. 31, 2012 Financial Guarantee Insurance Corporation [Member] Predecessor Ambac [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount	$ (80,309)	$ (14,125)	$ (277,508)	$ (80,309)	$ (14,125)	$ (277,508)
Ceded to Other Companies	(7,810)	(1,098)	(23,371)	(7,810)	(1,098)	(23,371)
Assumed from Other Companies
Net Amount	$ (72,499)	$ (13,027)	$ (254,137)	$ (72,499)	$ (13,027)	$ (254,137)
Percentage of Amount Assumed to Net

X

- Definition

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

+ References

No definition available.

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- 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

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- 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

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- 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

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- 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

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