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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Policies	Dec. 31, 2011 Policies
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	316	330
Remaining weighted-average contract period (in years)	13 years	13 years
Gross insured contractual payments outstanding:
Principal	$ 24,060,370	$ 31,072,226
Interest	9,243,183	13,963,359
Total	33,303,553	45,035,585
Gross undiscounted claim liability	12,120,462	12,511,194
Discount, gross claim liability	(2,138,631)	(2,279,110)
Gross claim liability before all subrogation and before reinsurance	9,981,831	10,232,084
Less:
Gross RMBS subrogation	(2,561,163)	(2,778,645)
Discount, RMBS subrogation	37,938	58,379
Discounted RMBS subrogation, before reinsurance	(2,523,225)	(2,720,266)
Less:
Gross other subrogation	(907,729)	(720,871)
Discount, other subrogation	36,949	52,539
Discounted other subrogation, before reinsurance	(870,780)	(668,332)
Gross claim liability, net of all subrogation and discounts, before reinsurance	6,587,826	6,843,486
Less: Unearned premium reserves	(603,794)	(546,520)
Plus: Loss adjustment expenses reserves	138,108	87,294
Claim liability reported on Balance Sheet, before reinsurance	6,122,140	6,384,260
Reinsurance recoverable reported on Balance Sheet	159,086	159,902
I/SL [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	14	27
Remaining weighted-average contract period (in years)	15 years	15 years
Gross insured contractual payments outstanding:
Principal	311,157	2,222,493
Interest	166,276	1,069,538
Total	477,433	3,292,031
Gross undiscounted claim liability	2,135	48,573
Discount, gross claim liability	(219)	(4,208)
Gross claim liability before all subrogation and before reinsurance	1,916	44,365
Less:
Gross RMBS subrogation
Discount, RMBS subrogation
Discounted RMBS subrogation, before reinsurance
Less:
Gross other subrogation
Discount, other subrogation
Discounted other subrogation, before reinsurance
Gross claim liability, net of all subrogation and discounts, before reinsurance	1,916	44,365
Less: Unearned premium reserves	(1,179)	(25,264)
Plus: Loss adjustment expenses reserves
Claim liability reported on Balance Sheet, before reinsurance	737	19,101
Reinsurance recoverable reported on Balance Sheet		1,117
IA [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	12	10
Remaining weighted-average contract period (in years)	21 years	20 years
Gross insured contractual payments outstanding:
Principal	786,998	354,713
Interest	715,129	100,448
Total	1,502,127	455,161
Gross undiscounted claim liability	40,898	10,667
Discount, gross claim liability	(3,532)	(2,316)
Gross claim liability before all subrogation and before reinsurance	37,366	8,351
Less:
Gross RMBS subrogation
Discount, RMBS subrogation
Discounted RMBS subrogation, before reinsurance
Less:
Gross other subrogation		(256)
Discount, other subrogation		77
Discounted other subrogation, before reinsurance		(179)
Gross claim liability, net of all subrogation and discounts, before reinsurance	37,366	8,172
Less: Unearned premium reserves	(21,626)	(5,126)
Plus: Loss adjustment expenses reserves
Claim liability reported on Balance Sheet, before reinsurance	15,740	3,046
Reinsurance recoverable reported on Balance Sheet	1,078	9
II [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	28	38
Remaining weighted-average contract period (in years)	18 years	18 years
Gross insured contractual payments outstanding:
Principal	1,245,793	2,060,102
Interest	379,237	1,088,036
Total	1,625,030	3,148,138
Gross undiscounted claim liability	49,521	52,355
Discount, gross claim liability	(3,247)	(3,800)
Gross claim liability before all subrogation and before reinsurance	46,274	48,555
Less:
Gross RMBS subrogation
Discount, RMBS subrogation
Discounted RMBS subrogation, before reinsurance
Less:
Gross other subrogation
Discount, other subrogation
Discounted other subrogation, before reinsurance
Gross claim liability, net of all subrogation and discounts, before reinsurance	46,274	48,555
Less: Unearned premium reserves	(17,120)	(22,111)
Plus: Loss adjustment expenses reserves
Claim liability reported on Balance Sheet, before reinsurance	29,154	26,444
Reinsurance recoverable reported on Balance Sheet	7,085	5,714
III [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	114	125
Remaining weighted-average contract period (in years)	20 years	20 years
Gross insured contractual payments outstanding:
Principal	9,161,747	13,342,814
Interest	4,905,775	8,117,496
Total	14,067,522	21,460,310
Gross undiscounted claim liability	4,051,076	4,766,815
Discount, gross claim liability	(1,342,910)	(1,440,704)
Gross claim liability before all subrogation and before reinsurance	2,708,166	3,326,111
Less:
Gross RMBS subrogation	(16,170)	(461,725)
Discount, RMBS subrogation	312	12,278
Discounted RMBS subrogation, before reinsurance	(15,858)	(449,447)
Less:
Gross other subrogation	(141,012)	(52,871)
Discount, other subrogation	21,238	6,550
Discounted other subrogation, before reinsurance	(119,774)	(46,321)
Gross claim liability, net of all subrogation and discounts, before reinsurance	2,572,534	2,830,343
Less: Unearned premium reserves	(450,247)	(335,332)
Plus: Loss adjustment expenses reserves
Claim liability reported on Balance Sheet, before reinsurance	2,122,287	2,495,011
Reinsurance recoverable reported on Balance Sheet	128,333	139,499
IV [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	147	129
Remaining weighted-average contract period (in years)	8 years	8 years
Gross insured contractual payments outstanding:
Principal	12,554,628	13,092,057
Interest	3,076,746	3,587,812
Total	15,631,374	16,679,869
Gross undiscounted claim liability	7,976,765	7,632,709
Discount, gross claim liability	(788,720)	(828,061)
Gross claim liability before all subrogation and before reinsurance	7,188,045	6,804,648
Less:
Gross RMBS subrogation	(2,544,993)	(2,316,920)
Discount, RMBS subrogation	37,626	46,101
Discounted RMBS subrogation, before reinsurance	(2,507,367)	(2,270,819)
Less:
Gross other subrogation	(766,717)	(667,744)
Discount, other subrogation	15,711	45,912
Discounted other subrogation, before reinsurance	(751,006)	(621,832)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,929,672	3,911,997
Less: Unearned premium reserves	(113,622)	(158,687)
Plus: Loss adjustment expenses reserves	138,108	87,294
Claim liability reported on Balance Sheet, before reinsurance	3,954,158	3,840,604
Reinsurance recoverable reported on Balance Sheet	22,590	13,563
V [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies	1	1
Remaining weighted-average contract period (in years)	6 years	6 years
Gross insured contractual payments outstanding:
Principal	47	47
Interest	20	29
Total	67	76
Gross undiscounted claim liability	67	75
Discount, gross claim liability	(3)	(21)
Gross claim liability before all subrogation and before reinsurance	64	54
Less:
Gross RMBS subrogation
Discount, RMBS subrogation
Discounted RMBS subrogation, before reinsurance
Less:
Gross other subrogation
Discount, other subrogation
Discounted other subrogation, before reinsurance
Gross claim liability, net of all subrogation and discounts, before reinsurance	64	54
Less: Unearned premium reserves
Plus: Loss adjustment expenses reserves
Claim liability reported on Balance Sheet, before reinsurance	64	54
Reinsurance recoverable reported on Balance Sheet

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This element represents the discounting on the gross claim liability for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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Remaining weighted average contract period of financial guarantee insurance contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This element represents the amount of insured contractual payments outstanding attributable to interest accrued on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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This element represents the amount of insured contractual payments outstanding attributable to the principal of the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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This element represents the net claim liability related to financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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This element represents the number of issued and outstanding contracts for each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

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This element represents the claim liability, reported on or included in the statement of financial position, related to financial guarantee insurance contracts and presented in the schedule of insured financial obligations with credit deterioration in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 163

-Section Appendix A

-Paragraph A13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751140-161288

+ Details

Name:	us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionClaimLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the amount of reinsurance recoverable, reported on or included in the statement of financial position, related to financial guarantee insurance contracts and presented in the schedule of insured financial obligations with credit deterioration in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 163

-Paragraph 31

-Subparagraph a(8)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 163

-Section Appendix A

-Paragraph A13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 9

-Subparagraph (a)(5)(viii)

-URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292

+ Details

Name:	us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionReinsuranceRecoverable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This element represents the amount of unearned premium revenue, reported on or included in the statement of financial position, related to financial guarantee insurance contracts and presented in the schedule of insured financial obligations with credit deterioration in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 9

-Subparagraph (a)(5)(ix)

-URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 163

-Paragraph 31

-Subparagraph a(9)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 163

-Section Appendix A

-Paragraph A13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant