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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.14) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -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 -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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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