Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial assets:
Fixed income securities	$ 713,467	$ 783,071
Other assets	15,021	16,779
Financial liabilities:
Obligations under investment and repurchase agreements	397,570	523,046
Liabilities subject to compromise	1,707,408	1,707,421
Long term debt	146,909	223,601
Derivative liabilities	187,121	190,653
Short-term Investments [Member]
Financial assets:
Fixed income securities	713,467	783,071
Fair Value, Level 1 [Member]
Financial assets:
Cash	90,065	15,999
Restricted cash	2,500	2,500
Total financial assets	1,199,374	1,162,207
Financial liabilities:
Total financial liabilities	1,975	627
Fair Value, Level 1 [Member] \| U.S. Government Obligations [Member]
Financial assets:
Fixed income securities	111,586	111,562
Fixed income securities, pledged as collateral	285,860	260,802
Fair Value, Level 1 [Member] \| Short-term Investments [Member]
Financial assets:
Fixed income securities	707,070	769,204
Fair Value, Level 2 [Member]
Financial assets:
Total financial assets	5,508,944	6,080,738
Financial liabilities:
Liabilities subject to compromise	469,215	112,233
Total financial liabilities	14,549,756	14,532,792
Fair Value, Level 2 [Member] \| Municipal Obligations [Member]
Financial assets:
Fixed income securities	1,861,774	2,002,999
Fair Value, Level 2 [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	1,118,489	1,119,570
Fair Value, Level 2 [Member] \| Foreign Obligations [Member]
Financial assets:
Fixed income securities	70,395	94,795
Fair Value, Level 2 [Member] \| U.S. Agency Obligations [Member]
Financial assets:
Fixed income securities	84,023	85,647
Fair Value, Level 2 [Member] \| Residential Mortgage-backed securities [Member]
Financial assets:
Fixed income securities	1,409,026	1,412,517
Fixed income securities, pledged as collateral		2,728
Fair Value, Level 2 [Member] \| Collateralized debt obligations [Member]
Financial assets:
Fixed income securities	29,977	33,755
Fair Value, Level 2 [Member] \| Other commercial asset-backed securities [Member]
Financial assets:
Fixed income securities	694,698	871,922
Fair Value, Level 2 [Member] \| Short-term Investments [Member]
Financial assets:
Fixed income securities	6,397	13,867
Fair Value, Level 3 [Member]
Financial assets:
Loans	8,587	16,934
Other assets	15,021	16,779
Total financial assets	17,283,525	16,372,076
Financial liabilities:
Obligations under investment and repurchase agreements	414,149	549,043
Long term debt, fair value		562,043
Long term debt	717,126
Liabilities for net financial guarantees written	4,075,022	2,642,795
Total financial liabilities	8,728,022	6,089,707
Fair Value, Level 3 [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	3,595	7,930
Fair Value, Level 3 [Member] \| U.S. Agency Obligations [Member]
Financial assets:
Fixed income securities		1,224
Fair Value, Level 3 [Member] \| Collateralized debt obligations [Member]
Financial assets:
Fixed income securities	6,832	12,482
Fair Value, Level 3 [Member] \| Other commercial asset-backed securities [Member]
Financial assets:
Fixed income securities	50,295	75,886
Fair Value, Level 3 [Member] \| Other [Member]
Financial assets:
Fixed income securities	100	100
Variable Interest Entity [Member]
Financial assets:
Fixed income securities	2,160,113	2,199,338
Loans	14,984,659	14,126,994
Financial liabilities:
Long term debt, fair value	14,877,975	14,039,450
Long term debt	15,113,094	14,288,540
Variable Interest Entity [Member] \| Fair Value, Level 1 [Member]
Financial assets:
Restricted cash	2,293	2,140
Variable Interest Entity [Member] \| Fair Value, Level 2 [Member]
Financial assets:
Loans	191,024	182,140
Financial liabilities:
Long term debt, fair value	12,094,342	12,320,810
Variable Interest Entity [Member] \| Fair Value, Level 3 [Member]
Financial assets:
Loans	14,984,659	14,126,994
Financial liabilities:
Long term debt, fair value	2,993,341	1,934,642
Variable Interest Entity [Member] \| Fair Value, Level 3 [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	2,160,113	2,199,338
Interest Rate Swaps [Member] \| Fair Value, Level 2 [Member]
Financial liabilities:
Derivative liabilities	(85,312)
Derivative liabilities	10,305	9,913
Interest Rate Swaps [Member] \| Fair Value, Level 2 [Member] \| Other Assets [Member]
Financial assets:
Derivative assets	43,141	260,851
Interest Rate Swaps [Member] \| Fair Value, Level 2 [Member] \| Liability position [Member]
Financial assets:
Derivative assets		(53)
Interest Rate Swaps [Member] \| Fair Value, Level 3 [Member]
Financial liabilities:
Derivative liabilities	(81,033)	(30,859)
Derivative liabilities	422,276	241,390
Interest Rate Swaps [Member] \| Fair Value, Level 3 [Member] \| Other Assets [Member]
Financial assets:
Derivative assets	54,323	150,801
Interest Rate Swaps [Member] \| Fair Value, Level 3 [Member] \| Liability position [Member]
Financial assets:
Derivative assets		(242,447)
Interest Rate Swaps [Member] \| Variable Interest Entity [Member] \| Fair Value, Level 2 [Member]
Financial liabilities:
Derivative liabilities	1,981,460	2,023,974
Future Contracts [Member] \| Fair Value, Level 1 [Member]
Financial liabilities:
Derivative liabilities	1,975	627
Call options on long-term debt [Member] \| Fair Value, Level 3 [Member]
Financial assets:
Derivative assets		6,055
Credit Derivatives [Member] \| Fair Value, Level 3 [Member]
Financial liabilities:
Derivative liabilities	187,121	190,653
Currency Swaps [Member] \| Fair Value, Level 2 [Member]
Financial liabilities:
Derivative liabilities		2,423
Currency Swaps [Member] \| Variable Interest Entity [Member] \| Fair Value, Level 2 [Member]
Financial liabilities:
Derivative liabilities		(27,779)
Derivative liabilities	79,491	90,857
Other contracts [Member] \| Fair Value, Level 2 [Member]
Financial liabilities:
Derivative liabilities	255	361
Carrying Amount [Member]
Financial assets:
Cash	90,065	15,999
Restricted cash	2,500	2,500
Loans at carrying amount	10,380	18,996
Other assets	15,021	16,779
Total financial assets	24,006,311	23,637,464
Financial liabilities:
Obligations under investment and repurchase agreements	415,846	546,546
Liabilities subject to compromise	1,622,189	1,622,189
Long term debt	146,909	223,601
Liabilities for net financial guarantees written	7,480,962	7,547,288
Total financial liabilities	27,295,528	26,729,724
Carrying Amount [Member] \| Municipal Obligations [Member]
Financial assets:
Fixed income securities	1,861,774	2,002,999
Carrying Amount [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	1,122,084	1,127,500
Carrying Amount [Member] \| Foreign Obligations [Member]
Financial assets:
Fixed income securities	70,395	94,795
Carrying Amount [Member] \| U.S. Government Obligations [Member]
Financial assets:
Fixed income securities	111,586	111,562
Fixed income securities, pledged as collateral	285,860	260,802
Carrying Amount [Member] \| U.S. Agency Obligations [Member]
Financial assets:
Fixed income securities	84,023	86,871
Carrying Amount [Member] \| Residential Mortgage-backed securities [Member]
Financial assets:
Fixed income securities	1,409,026	1,412,517
Fixed income securities, pledged as collateral		2,728
Carrying Amount [Member] \| Collateralized debt obligations [Member]
Financial assets:
Fixed income securities	36,809	46,237
Carrying Amount [Member] \| Other commercial asset-backed securities [Member]
Financial assets:
Fixed income securities	744,993	947,808
Carrying Amount [Member] \| Short-term Investments [Member]
Financial assets:
Fixed income securities	713,467	783,071
Carrying Amount [Member] \| Other [Member]
Financial assets:
Fixed income securities	100	100
Carrying Amount [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	2,293	2,140
Loans at carrying amount	15,188,358	14,329,515
Financial liabilities:
Long term debt, fair value	15,113,094	14,288,540
Carrying Amount [Member] \| Variable Interest Entity [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	2,160,113	2,199,338
Carrying Amount [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	(166,345)	(30,859)
Derivative liabilities	432,581	251,303
Carrying Amount [Member] \| Interest Rate Swaps [Member] \| Other Assets [Member]
Financial assets:
Derivative assets	97,464	411,652
Carrying Amount [Member] \| Interest Rate Swaps [Member] \| Liability position [Member]
Financial assets:
Derivative assets		(242,500)
Carrying Amount [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,981,460	2,023,974
Carrying Amount [Member] \| Future Contracts [Member]
Financial liabilities:
Derivative liabilities	1,975	627
Carrying Amount [Member] \| Call options on long-term debt [Member]
Financial assets:
Derivative assets		6,055
Carrying Amount [Member] \| Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	187,121	190,653
Carrying Amount [Member] \| Currency Swaps [Member]
Financial liabilities:
Derivative liabilities		2,423
Carrying Amount [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities		(27,779)
Derivative liabilities	79,491	90,857
Carrying Amount [Member] \| Other contracts [Member]
Financial liabilities:
Derivative liabilities	255	361
Total Fair Value [Member]
Financial assets:
Cash	90,065	15,999
Restricted cash	2,500	2,500
Loans	8,587	16,934
Other assets	15,021	16,779
Total financial assets	23,991,843	23,615,021
Financial liabilities:
Obligations under investment and repurchase agreements	414,149	549,043
Liabilities subject to compromise	469,215	112,233
Long term debt, fair value		562,043
Long term debt	717,126
Liabilities for net financial guarantees written	4,075,022	2,642,795
Total financial liabilities	23,279,733	20,623,126
Total Fair Value [Member] \| Municipal Obligations [Member]
Financial assets:
Fixed income securities	1,861,774	2,002,999
Total Fair Value [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	1,122,084	1,127,500
Total Fair Value [Member] \| Foreign Obligations [Member]
Financial assets:
Fixed income securities	70,395	94,795
Total Fair Value [Member] \| U.S. Government Obligations [Member]
Financial assets:
Fixed income securities	111,586	111,562
Fixed income securities, pledged as collateral	285,860	260,802
Total Fair Value [Member] \| U.S. Agency Obligations [Member]
Financial assets:
Fixed income securities	84,023	86,871
Total Fair Value [Member] \| Residential Mortgage-backed securities [Member]
Financial assets:
Fixed income securities	1,409,026	1,412,517
Fixed income securities, pledged as collateral		2,728
Total Fair Value [Member] \| Collateralized debt obligations [Member]
Financial assets:
Fixed income securities	36,809	46,237
Total Fair Value [Member] \| Other commercial asset-backed securities [Member]
Financial assets:
Fixed income securities	744,993	947,808
Total Fair Value [Member] \| Short-term Investments [Member]
Financial assets:
Fixed income securities	713,467	783,071
Total Fair Value [Member] \| Other [Member]
Financial assets:
Fixed income securities	100	100
Total Fair Value [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	2,293	2,140
Loans	15,175,683	14,309,134
Financial liabilities:
Long term debt, fair value	15,087,683	14,255,452
Total Fair Value [Member] \| Variable Interest Entity [Member] \| Corporate Obligations [Member]
Financial assets:
Fixed income securities	2,160,113	2,199,338
Total Fair Value [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	(166,345)	(30,859)
Derivative liabilities	432,581	251,303
Total Fair Value [Member] \| Interest Rate Swaps [Member] \| Other Assets [Member]
Financial assets:
Derivative assets	97,464	411,652
Total Fair Value [Member] \| Interest Rate Swaps [Member] \| Liability position [Member]
Financial assets:
Derivative assets		(242,500)
Total Fair Value [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,981,460	2,023,974
Total Fair Value [Member] \| Future Contracts [Member]
Financial liabilities:
Derivative liabilities	1,975	627
Total Fair Value [Member] \| Call options on long-term debt [Member]
Financial assets:
Derivative assets		6,055
Total Fair Value [Member] \| Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	187,121	190,653
Total Fair Value [Member] \| Currency Swaps [Member]
Financial liabilities:
Derivative liabilities		2,423
Total Fair Value [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities		(27,779)
Derivative liabilities	79,491	90,857
Total Fair Value [Member] \| Other contracts [Member]
Financial liabilities:
Derivative liabilities	$ 255	$ 361

Guaranteed investment agreements at fair value.

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Liabilities subject to compromise at fair value.

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Fair value of restricted cash and cash equivalents.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Carrying value as of the balance sheet date of the sum of the obligations to contract holders to provide to them an agreed upon rate of return pursuant to the terms of the underlying contract. These contracts represent lending by the contract holders to the entity in return for a guaranteed (primarily fixed) interest rate until maturity, unless called earlier if the contracts provide that option to the contract holders (usually institutions). There is little or no insurance risk for the entity.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Total amount of liabilities subject to compromise.

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