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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 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financial assets: |  |
Fixed income securities | $ 661,658 | $ 783,071
Loans | 9,203 | 18,996
Other assets | 14,557 | 16,779
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 356,091 | 523,046
Liabilities subject to compromise | 1,704,904 | 1,707,421
Long term debt, including accrued interest | 150,170 | 223,601
Derivative liabilities | 213,585 | 190,653
Total Fair Value [Member] |  |
Financial assets: |  |
Cash | 43,837 | 15,999
Restricted cash |  | 2,500
Loans | 7,387 | 16,934
Other assets | 14,557 | 16,779
Total financial assets | 24,267,353 | 23,615,021
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 361,905 | 549,043
Liabilities subject to compromise | 434,823 | 112,233
Long term debt |  | 562,043
Long term debt, including accrued interest | 801,277 |
Liabilities for net financial guarantees written | 3,091,257 | 2,642,795
Total financial liabilities | 22,778,490 | 20,623,126
Carrying Amount [Member] |  |
Financial assets: |  |
Cash | 43,837 | 15,999
Restricted cash |  | 2,500
Loans | 9,203 | 18,996
Other assets | 14,557 | 16,779
Total financial assets | 24,277,829 | 23,637,464
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 362,017 | 546,546
Liabilities subject to compromise | 1,622,189 | 1,622,189
Long term debt, including accrued interest | 377,524 | 391,372
Liabilities for net financial guarantees written | 7,074,808 | 7,547,288
Total financial liabilities | 27,547,541 | 26,897,495
Variable interest entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,261,294 | 2,199,338
Loans | 15,359,073 | 14,126,994
Financial liabilities: |  |
Long term debt | 15,200,538 | 14,039,450
Long term debt, including accrued interest | 15,436,008 | 14,288,540
Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Restricted cash | 2,290 | 2,140
Loans | 15,560,051 | 14,309,134
Financial liabilities: |  |
Long term debt | 15,414,233 | 14,255,452
Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Restricted cash | 2,290 | 2,140
Loans | 15,568,711 | 14,329,515
Financial liabilities: |  |
Long term debt | 15,436,008 | 14,288,540
Future contracts [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets | 1,253 |
Financial liabilities: |  |
Derivative liabilities |  | 627
Future contracts [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets | 1,253 |
Financial liabilities: |  |
Derivative liabilities |  | 627
Credit derivatives [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 213,585 | 190,653
Credit derivatives [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 213,585 | 190,653
Currency swaps [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities |  | 2,423
Currency swaps [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities |  | 2,423
Other contracts [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 220 | 361
Other contracts [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 220 | 361
Call options on long-term debt [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets |  | 6,055
Call options on long-term debt [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets |  | 6,055
Other Assets [Member] | Interest rate swaps [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets | 46,752 | 411,652
Financial liabilities: |  |
Derivative liabilities | (151,365) | (30,859)
Other Assets [Member] | Interest rate swaps [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets | 46,752 | 411,652
Financial liabilities: |  |
Derivative liabilities | (151,365) | (30,859)
Other Assets [Member] | Currency swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities |  | (27,779)
Other Assets [Member] | Currency swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities |  | (27,779)
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Derivative assets |  | (242,500)
Financial liabilities: |  |
Derivative liabilities | 390,774 | 251,303
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Derivative assets |  | (242,500)
Financial liabilities: |  |
Derivative liabilities | 390,774 | 251,303
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2,131,315 | 2,023,974
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2,131,315 | 2,023,974
Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 90,466 | 90,857
Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 90,466 | 90,857
Municipal obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,814,730 | 2,002,999
Municipal obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,814,730 | 2,002,999
Corporate obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,112,174 | 1,127,500
Corporate obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,112,174 | 1,127,500
Corporate obligations [Member] | Variable interest entity [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 2,261,294 | 2,199,338
Corporate obligations [Member] | Variable interest entity [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 2,261,294 | 2,199,338
Foreign obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 70,112 | 94,795
Foreign obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 70,112 | 94,795
U.S. government obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 127,283 | 111,562
Fixed income securities, pledged as collateral | 265,779 | 260,802
U.S. government obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 127,283 | 111,562
Fixed income securities, pledged as collateral | 265,779 | 260,802
U.S. agency obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 82,535 | 86,871
U.S. agency obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 82,535 | 86,871
Residential mortgage-backed securities [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,455,582 | 1,412,517
Fixed income securities, pledged as collateral |  | 2,728
Residential mortgage-backed securities [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,455,582 | 1,412,517
Fixed income securities, pledged as collateral |  | 2,728
Collateralized debt obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 33,342 | 46,237
Collateralized debt obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 33,342 | 46,237
Other commercial asset-backed [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 706,637 | 947,808
Other commercial asset-backed [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 706,637 | 947,808
Short-term [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 661,658 | 783,071
Short-term [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 661,658 | 783,071
Other [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 100 | 100
Other [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 100 | 100
Level 1 [Member] |  |
Financial assets: |  |
Cash | 43,837 | 15,999
Restricted cash |  | 2,500
Total financial assets | 1,098,328 | 1,162,207
Financial liabilities: |  |
Total financial liabilities |  | 627
Level 1 [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Restricted cash | 2,290 | 2,140
Level 1 [Member] | Future contracts [Member] |  |
Financial assets: |  |
Derivative assets | 1,253 |
Financial liabilities: |  |
Derivative liabilities |  | 627
Level 1 [Member] | U.S. government obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 127,283 | 111,562
Fixed income securities, pledged as collateral | 265,779 | 260,802
Level 1 [Member] | Short-term [Member] |  |
Financial assets: |  |
Fixed income securities | 657,886 | 769,204
Level 2 [Member] |  |
Financial assets: |  |
Total financial assets | 5,466,212 | 6,080,738
Financial liabilities: |  |
Liabilities subject to compromise | 434,823 | 112,233
Total financial liabilities | 15,245,213 | 14,532,792
Level 2 [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Loans | 200,978 | 182,140
Financial liabilities: |  |
Long term debt | 12,457,732 | 12,320,810
Level 2 [Member] | Currency swaps [Member] |  |
Financial liabilities: |  |
Derivative liabilities |  | 2,423
Level 2 [Member] | Other contracts [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 220 | 361
Level 2 [Member] | Other Assets [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets | 46,752 | 260,851
Financial liabilities: |  |
Derivative liabilities | (151,365) |
Level 2 [Member] | Other Assets [Member] | Currency swaps [Member] | Variable interest entity [Member] |  |
Financial liabilities: |  |
Derivative liabilities |  | (27,779)
Level 2 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets |  | (53)
Financial liabilities: |  |
Derivative liabilities | 282,022 | 9,913
Level 2 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 2,131,315 | 2,023,974
Level 2 [Member] | Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 90,466 | 90,857
Level 2 [Member] | Municipal obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 1,814,730 | 2,002,999
Level 2 [Member] | Corporate obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 1,108,518 | 1,119,570
Level 2 [Member] | Foreign obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 70,112 | 94,795
Level 2 [Member] | U.S. agency obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 82,535 | 85,647
Level 2 [Member] | Residential mortgage-backed securities [Member] |  |
Financial assets: |  |
Fixed income securities | 1,455,582 | 1,412,517
Fixed income securities, pledged as collateral |  | 2,728
Level 2 [Member] | Collateralized debt obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 26,860 | 33,755
Level 2 [Member] | Other commercial asset-backed [Member] |  |
Financial assets: |  |
Fixed income securities | 656,373 | 871,922
Level 2 [Member] | Short-term [Member] |  |
Financial assets: |  |
Fixed income securities | 3,772 | 13,867
Level 3 [Member] |  |
Financial assets: |  |
Loans | 7,387 | 16,934
Other assets | 14,557 | 16,779
Total financial assets | 17,702,813 | 16,372,076
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 361,905 | 549,043
Long term debt |  | 562,043
Long term debt, including accrued interest | 801,277 |
Liabilities for net financial guarantees written | 3,091,257 | 2,642,795
Total financial liabilities | 7,533,277 | 6,089,707
Level 3 [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Loans | 15,359,073 | 14,126,994
Financial liabilities: |  |
Long term debt | 2,956,501 | 1,934,642
Level 3 [Member] | Credit derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 213,585 | 190,653
Level 3 [Member] | Call options on long-term debt [Member] |  |
Financial assets: |  |
Derivative assets |  | 6,055
Level 3 [Member] | Other Assets [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets |  | 150,801
Financial liabilities: |  |
Derivative liabilities |  | (30,859)
Level 3 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] |  |
Financial assets: |  |
Derivative assets |  | (242,447)
Financial liabilities: |  |
Derivative liabilities | 108,752 | 241,390
Level 3 [Member] | Corporate obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 3,656 | 7,930
Level 3 [Member] | Corporate obligations [Member] | Variable interest entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,261,294 | 2,199,338
Level 3 [Member] | U.S. agency obligations [Member] |  |
Financial assets: |  |
Fixed income securities |  | 1,224
Level 3 [Member] | Collateralized debt obligations [Member] |  |
Financial assets: |  |
Fixed income securities | 6,482 | 12,482
Level 3 [Member] | Other commercial asset-backed [Member] |  |
Financial assets: |  |
Fixed income securities | 50,264 | 75,886
Level 3 [Member] | Other [Member] |  |
Financial assets: |  |
Fixed income securities | $ 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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