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Fresh Start Financial Statement Reporting - Schedule of Calculation of Pre-Tax Gain, Recorded as Reorganization on Consolidated Statement of Total Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Dec. 31, 2012
Extinguishment of Debt [Line Items]
Pre-tax gain from cancellation and satisfaction of Predecessor Ambac debt	$ 1,521,435
Reorganization Item Adjustments [Member]
Extinguishment of Debt [Line Items]
Liabilities subject to compromise	1,704,641
Long-term debt	973
Accrued interest payable	821
Total debt discharged	1,706,435
Reorganization Item Adjustments [Member] | Common Stock Successor Ambac [Member]
Extinguishment of Debt [Line Items]
Less: common stock	(450)
Reorganization Item Adjustments [Member] | Additional Paid-In Capital Successor [Member]
Extinguishment of Debt [Line Items]
Additional paid-in capital	(184,550)
Predecessor Ambac [Member]
Extinguishment of Debt [Line Items]
Liabilities subject to compromise	(1,704,641)	(1,704,904)
Less: common stock		(3,080)
Additional paid-in capital		(2,172,027)
Pre-tax gain from cancellation and satisfaction of Predecessor Ambac debt	$ 1,521,435

X

- Definition

Fresh start adjustment to accrued interest payable.

+ References

No definition available.

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X

- Definition

Fresh start adjustment to long term debt.

+ References

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X

- Definition

Total debt discharged as a result of bankruptcy emergence.

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X

- Definition

Pre-Tax Gain on Extinguishment of Obligations

+ References

No definition available.

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- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.30(a)(1))

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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- Definition

Total amount of liabilities subject to compromise.

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-Section 55

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-Publisher AICPA

-Name Statement of Position (SOP)

-Number 90-7

-Paragraph 26

-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.



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