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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 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financial assets: |  |
Short term investments | $ 767,932 | $ 661,658
Other investments | 113,812 | 100
Other assets | 14,230 | 14,557
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 357,371 | 356,091
Liabilities subject to compromise | 1,704,641 | 1,704,904
Long term debt, including accrued interest | 153,873 | 150,170
Derivative liabilities | 203,307 | 213,585
Total Fair Value [Member] |  |
Financial assets: |  |
Cash | 53,135 | 43,837
Loans | 7,119 | 7,387
Other assets | 14,230 | 14,557
Total financial assets | 23,435,256 | 24,345,454
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 362,208 | 361,905
Liabilities subject to compromise | 909,138 | 434,823
Long-term debt |  | 801,277
Long term debt, including accrued interest | 1,110,259 |
Liabilities for net financial guarantees written | 4,576,031 | 3,091,257
Total financial liabilities | 23,988,213 | 22,856,591
Carrying Amount [Member] |  |
Financial assets: |  |
Cash | 53,135 | 43,837
Loans | 8,691 | 9,203
Other assets | 14,230 | 14,557
Total financial assets | 23,445,834 | 24,355,930
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 363,297 | 362,017
Liabilities subject to compromise | 1,690,312 |
Liabilities subject to compromise |  | 1,690,312
Long term debt, including accrued interest | 399,505 | 377,524
Liabilities for net financial guarantees written | 6,921,299 | 7,074,808
Total financial liabilities | 26,427,157 | 27,693,765
Variable interest entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,414,607 | 2,261,294
Loans | 14,116,811 | 15,359,073
Financial liabilities: |  |
Long-term debt | 13,996,531 | 15,200,538
Long term debt, including accrued interest | 14,229,373 | 15,436,008
Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Restricted cash | 2,258 | 2,290
Loans | 14,318,834 | 15,560,051
Financial liabilities: |  |
Long-term debt | 14,207,206 | 15,414,233
Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Restricted cash | 2,258 | 2,290
Loans | 14,327,840 | 15,568,711
Financial liabilities: |  |
Long-term debt | 14,229,373 | 15,436,008
Futures contracts [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets |  | 1,253
Financial liabilities: |  |
Derivative liabilities | 911 |
Futures contracts [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets |  | 1,253
Financial liabilities: |  |
Derivative liabilities | 911 |
Credit derivatives [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 203,307 | 213,585
Credit derivatives [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 203,307 | 213,585
Other contracts [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 215 | 220
Other contracts [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 215 | 220
Other assets [Member] | Interest rate swaps [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets | 112,811 | 124,853
Financial liabilities: |  |
Derivative liabilities | (65,636) | (73,264)
Other assets [Member] | Interest rate swaps [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets | 112,811 | 124,853
Financial liabilities: |  |
Derivative liabilities | (65,636) | (73,264)
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities | 366,949 | 390,774
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities | 366,949 | 390,774
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2,231,863 | 2,131,315
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2,231,863 | 2,131,315
Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 85,762 | 90,466
Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 85,762 | 90,466
Municipal obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,794,355 | 1,848,932
Municipal obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,794,355 | 1,848,932
Corporate obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,069,073 | 1,077,972
Corporate obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,069,073 | 1,077,972
Corporate obligations [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 2,414,607 | 2,261,294
Corporate obligations [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 2,414,607 | 2,261,294
Foreign obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 11,878 | 70,112
Foreign obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 11,878 | 70,112
U.S. government obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 98,312 | 127,283
Fixed income securities, pledged as collateral | 228,228 | 265,779
U.S. government obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 98,312 | 127,283
Fixed income securities, pledged as collateral | 228,228 | 265,779
U.S. agency obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 53,975 | 82,535
U.S. agency obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 53,975 | 82,535
Residential mortgage-backed securities [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,536,889 | 1,455,582
Residential mortgage-backed securities [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,536,889 | 1,455,582
Collateralized debt obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 27,357 | 33,342
Collateralized debt obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 27,357 | 33,342
Other commercial asset-backed [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 810,451 | 706,637
Other commercial asset-backed [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 810,451 | 706,637
Short-term [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Short term investments | 767,932 | 661,658
Short-term [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Short term investments | 767,932 | 661,658
Other [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Other investments | 113,812 | 100
Other [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Other investments | 113,812 | 100
Level 1 [Member] |  |
Financial assets: |  |
Cash | 53,135 | 43,837
Total financial assets | 1,147,312 | 1,098,328
Financial liabilities: |  |
Total financial liabilities | 911 |
Level 1 [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Restricted cash | 2,258 | 2,290
Level 1 [Member] | Futures contracts [Member] |  |
Financial assets: |  |
Derivative assets |  | 1,253
Financial liabilities: |  |
Derivative liabilities | 911 |
Level 1 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets |  |
Level 1 [Member] | U.S. government obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 98,312 | 127,283
Fixed income securities, pledged as collateral | 228,228 | 265,779
Level 1 [Member] | Short-term [Member] |  |
Financial assets: |  |
Short term investments | 765,379 | 657,886
Level 2 [Member] |  |
Financial assets: |  |
Total financial assets | 5,677,286 | 5,544,313
Financial liabilities: |  |
Liabilities subject to compromise | 909,138 | 434,823
Total financial liabilities | 15,699,526 | 15,323,314
Level 2 [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Loans | 202,023 | 200,978
Financial liabilities: |  |
Long-term debt | 12,296,617 | 12,457,732
Level 2 [Member] | Futures contracts [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities |  |
Level 2 [Member] | Other contracts [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 215 | 220
Level 2 [Member] | Other assets [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets | 112,811 | 124,853
Financial liabilities: |  |
Derivative liabilities | (65,636) | (73,264)
Level 2 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities | 241,567 | 282,022
Level 2 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2,231,863 | 2,131,315
Level 2 [Member] | Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 85,762 | 90,466
Level 2 [Member] | Municipal obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 1,794,355 | 1,848,932
Level 2 [Member] | Corporate obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 1,065,421 | 1,074,316
Level 2 [Member] | Foreign obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 11,878 | 70,112
Level 2 [Member] | U.S. agency obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 53,975 | 82,535
Level 2 [Member] | Residential mortgage-backed securities [Member] |  |
Financial assets: |  |
Fixed income securities | 1,536,889 | 1,455,582
Level 2 [Member] | Collateralized debt obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 23,452 | 26,860
Level 2 [Member] | Other commercial asset-backed [Member] |  |
Financial assets: |  |
Fixed income securities | 760,217 | 656,373
Level 2 [Member] | Short-term [Member] |  |
Financial assets: |  |
Short term investments | 2,553 | 3,772
Level 2 [Member] | Other [Member] |  |
Financial assets: |  |
Other investments | 113,712 |
Level 3 [Member] |  |
Financial assets: |  |
Loans | 7,119 | 7,387
Other assets | 14,230 | 14,557
Total financial assets | 16,610,658 | 17,702,813
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 362,208 | 361,905
Long-term debt |  | 801,277
Long term debt, including accrued interest | 1,110,259 |
Liabilities for net financial guarantees written | 4,576,031 | 3,091,257
Total financial liabilities | 8,287,776 | 7,533,277
Level 3 [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Loans | 14,116,811 | 15,359,073
Financial liabilities: |  |
Long-term debt | 1,910,589 | 2,956,501
Level 3 [Member] | Futures contracts [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities |  |
Level 3 [Member] | Credit derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 203,307 | 213,585
Level 3 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets |  |
Financial liabilities: |  |
Derivative liabilities | 125,382 | 108,752
Level 3 [Member] | Corporate obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 3,652 | 3,656
Level 3 [Member] | Corporate obligations [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,414,607 | 2,261,294
Level 3 [Member] | Collateralized debt obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 3,905 | 6,482
Level 3 [Member] | Other commercial asset-backed [Member] |  |
Financial assets: |  |
Fixed income securities | 50,234 | 50,264
Level 3 [Member] | Other [Member] |  |
Financial assets: |  |
Other investments | $ 100 | $ 100

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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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