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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 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | $ 157,020 | $ 135,224 |  |
Other Investments | 28,294 | 18,317 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 47,275 | 19,223 | $ 19,940 | $ 9,969
Derivative assets | 0 | 656 |  |
Short-Term Debt | 150,000 |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 317 | 0 |  |
Fixed income securities, amortized cost | 289,712 | 341,685 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 260 | 643 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 5,351 | 6,594 |  |
Equity Method Investments Excluded From Fair Value | 177 |  |  |
Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 127,601 | 200,510 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 127,588 | 200,506 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13 | 4 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0 |  |
Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 5,061 | 0 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 5,049 | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 14 | 0 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 2 | 0 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,142 | 0 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 3,131 | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13 | 0 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 2 | 0 |  |
Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,446 | 0 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 2,475 | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 29 | 0 |  |
US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 40,995 | 38,522 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 41,706 | 39,091 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 98 | 364 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 809 | 933 |  |
Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 89,192 | 87,991 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 92,990 | 92,694 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 107 | 262 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 3,905 | 4,965 |  |
Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 14,083 | 8,711 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 14,646 | 9,394 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 13 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 570 | 696 |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,101 | 0 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 2,127 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 0 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 34 | 0 |  |
Warrant [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 656 |  |
Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 47,276 | 19,223 |  |
Loans | 3,434 | 0 |  |
Total financial assets | 363,625 | 373,930 |  |
Short-Term Debt | 152,560 | 0 |  |
Financial liabilities: |  |  |  |
Total financial liabilities | 152,877 | 0 |  |
Carrying Amount [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 28,294 | 18,317 |  |
Carrying Amount [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 127,601 | 200,510 |  |
Carrying Amount [Member] | Warrant [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 656 |  |
Carrying Amount [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 317 | 0 |  |
Total Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 47,276 | 19,223 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 7,499 | 5,817 |  |
Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 47,276 | 19,223 |  |
Total financial assets | 215,872 | 258,255 |  |
Short-Term Debt | 0 | 0 |  |
Financial liabilities: |  |  |  |
Total financial liabilities | 0 | 0 |  |
Level 1 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 0 | 0 |  |
Level 1 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 127,601 | 200,510 |  |
Level 1 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 0 |  |
Level 1 [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 | 0 |  |
Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Total financial assets | 116,025 | 82,782 |  |
Short-Term Debt | 0 | 0 |  |
Financial liabilities: |  |  |  |
Total financial liabilities | 317 | 0 |  |
Level 2 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 0 | 0 |  |
Level 2 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 0 | 0 |  |
Level 2 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 0 |  |
Level 2 [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 317 | 0 |  |
Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Total financial assets | 3,434 | 14,576 |  |
Short-Term Debt | 152,560 | 0 |  |
Financial liabilities: |  |  |  |
Total financial liabilities | 152,560 | 0 |  |
Level 3 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 0 | 0 |  |
Level 3 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 0 | 0 |  |
Level 3 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 3,434 | 0 |  |
Level 3 [Member] | Warrant [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 656 |  |
Level 3 [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 | 0 |  |
Municipal Bonds [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 14,083 | 8,711 |  |
Corporate Debt Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 89,192 | 87,991 |  |
US Government Debt Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 40,995 | 38,522 |  |
Residential Mortgage-Backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,446 | 0 |  |
Collateralized Debt Obligations [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,142 | 0 |  |
Asset-backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 5,061 | 0 |  |
Commercial Mortgage Backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,101 | 0 |  |
Fair Value, Recurring [Member] |  |  |  |
Financial assets: |  |  |  |
Total financial assets | 342,830 | 361,430 |  |
Short-Term Debt | 152,560 | 0 |  |
Financial liabilities: |  |  |  |
Total financial liabilities | 152,877 | 0 |  |
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 7,499 | 5,817 |  |
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 127,601 | 200,510 |  |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 5,061 | 0 |  |
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,142 | 0 |  |
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,446 | 0 |  |
Fair Value, Recurring [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 40,995 | 38,522 |  |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 89,192 | 87,991 |  |
Fair Value, Recurring [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 14,083 | 8,711 |  |
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 3,434 | 0 |  |
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,101 | 0 |  |
Fair Value, Recurring [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 317 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 40,995 | 38,522 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 5,061 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,142 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,446 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 89,192 | 74,071 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 14,083 | 8,711 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,101 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 13,920 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | $ 0 | $ 0 |  |

X
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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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