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Income Taxes Income Taxes - NOL Usage Table (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Net Income Loss Reconciliation [Line Items]
NOL allocated amount	$ 4,831,481

X

- Definition

Net Income Loss Reconciliation [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	ambc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 740



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

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Balance Type:	debit
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