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Derivative Instruments - Additional Information (Detail)	Sep. 30, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Value of right to reclaim cash collateral and posted margin, recorded in "Other assets"	$ 175,214,000	$ 158,240,000
Value of obligation to return cash collateral, recorded in "Other liabilities"	0	0
Net liability fair value of all derivative instruments linked to Ambac's own credit risk	101,698,000	92,869,000
Fair value of posted assets as collateral	$ 153,901,000	$ 118,844,000
Credit Derivatives [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Number of credit derivative contracts | Contract	4	4
Net liability fair value of credit derivative contracts	$ 14,958,000	$ 60,729,000
Notional value of credit derivative contracts	$ 259,852,000	$ 270,747,000

X

- Definition

Derivative Liability Fair Value For Credit Derivative Contracts On Adversely Classified Credit Listing

+ References

No definition available.

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X

- Definition

Notional principal outstanding of Credit Derivative Contracts on adversely classified credit listing.

+ References

No definition available.

+ Details

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- Definition

Number of Credit Derivative Contracts on adversely classified credit listing.

+ References

No definition available.

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- Definition

Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]

+ References

No definition available.

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 8



-Subparagraph (b)



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-Topic 210



-SubTopic 20



-Section 50



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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-Section 55



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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 55



-Paragraph 13



-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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-Section 50



-Paragraph 3



-Subparagraph (d)(2)



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-Publisher FASB



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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



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-Paragraph 4H



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