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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | $ 122,295 | $ 157,020 |  |
Other Investments | 24,971 | 28,294 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 70,090 | 47,275 | $ 19,223 | $ 19,940
Derivative assets | 0 | 0 |  |
Short-Term Debt | 0 | 150,000 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 8 | 317 |  |
Fixed income securities, amortized cost | 269,848 | 289,712 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,205 | 260 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 2,316 | 5,351 |  |
Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 146,442 | 127,601 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 146,434 | 127,588 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 13 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0 |  |
Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,795 | 5,061 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 1,772 | 5,049 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 23 | 14 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 2 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,975 | 3,142 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 1,963 | 3,131 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 12 | 13 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 2 |  |
Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,597 | 2,446 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 1,604 | 2,475 |  |
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 | 7 | 29 |  |
US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 35,424 | 40,995 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 35,190 | 41,706 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 365 | 98 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 131 | 809 |  |
Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 66,573 | 89,192 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 67,881 | 92,990 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 634 | 107 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 1,942 | 3,905 |  |
Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 11,590 | 14,083 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 11,697 | 14,646 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 121 | 7 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 228 | 570 |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,341 | 2,101 |  |
Financial liabilities: |  |  |  |
Fixed income securities, amortized cost | 3,307 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 42 | 8 |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 8 | 34 |  |
Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 68,440 | 47,275 |  |
Loans | 0 | 3,434 |  |
Total financial assets | 362,148 | 363,624 |  |
Short-Term Debt | 0 | 152,560 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 118,901 |  |  |
Total financial liabilities | 118,909 | 317 |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 28,294 |  |
Carrying Amount [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 24,971 | 127,601 |  |
Carrying Amount [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 146,442 |  |  |
Carrying Amount [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 8 |  |  |
Total Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 68,440 | 47,275 |  |
Financial liabilities: |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 7,499 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 7,454 | 7,499 |  |
Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 68,440 | 47,275 |  |
Total financial assets | 250,306 | 215,871 |  |
Short-Term Debt | 0 | 0 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 0 |  |  |
Total financial liabilities | 0 | 0 |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0 |  |
Level 1 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 0 | 127,601 |  |
Level 1 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 146,442 |  |  |
Level 1 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 0 |  |
Level 1 [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 |  |  |
Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Total financial assets | 86,871 | 116,025 |  |
Short-Term Debt | 0 | 0 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 0 |  |  |
Total financial liabilities | 8 | 317 |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 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 |  |  |
Level 2 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 0 |  |
Level 2 [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 8 |  |  |
Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Total financial assets | 0 | 3,434 |  |
Short-Term Debt | 0 | 152,560 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 121,343 |  |  |
Total financial liabilities | 121,343 | 152,560 |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 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 |  |  |
Level 3 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 3,434 |  |
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 | 11,590 | 14,083 |  |
Financial liabilities: |  |  |  |
Total financial liabilities |  | 152,877 |  |
Corporate Debt Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 66,573 | 89,192 |  |
US Government Debt Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 35,424 | 40,995 |  |
Residential Mortgage-Backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,597 | 2,446 |  |
Collateralized Debt Obligations [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,975 | 3,142 |  |
Asset-backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,795 | 5,061 |  |
Commercial Mortgage Backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,341 | 2,101 |  |
Fair Value, Recurring [Member] |  |  |  |
Financial assets: |  |  |  |
Total financial assets | 344,631 | 342,829 |  |
Short-Term Debt | 0 | 152,560 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 121,343 |  |  |
Total financial liabilities | 121,351 | 317 |  |
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 7,454 | 127,601 |  |
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 146,442 |  |  |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,795 | 5,061 |  |
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,975 | 3,142 |  |
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,597 | 2,446 |  |
Fair Value, Recurring [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 35,424 | 40,995 |  |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 66,573 | 89,192 |  |
Fair Value, Recurring [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 11,590 | 14,083 |  |
Financial liabilities: |  |  |  |
Total financial liabilities |  | 152,877 |  |
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 3,434 |  |
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,341 | 2,101 |  |
Fair Value, Recurring [Member] | Foreign Exchange Forward |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 8 |  |  |
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 | 35,424 | 40,995 |  |
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 |  |
Financial liabilities: |  |  |  |
Total financial liabilities |  | 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 | 1,795 | 5,061 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,975 | 3,142 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 1,597 | 2,446 |  |
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 | 66,573 | 89,192 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 11,590 | 14,083 |  |
Financial liabilities: |  |  |  |
Total financial liabilities |  | 317 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 3,341 | 2,101 |  |
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 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 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 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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