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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | $ 426,926 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,181 | 260 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,687 | 5,351 |
Financial assets: |  |  |
Derivative assets | 378 | 0 |
Other assets | 0 |  |
Short-Term Debt | 0 | 150,000 |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Equity Securities Excluded From Fair Value Table | 20,618 | 20,618 |
Debt Securities, Available-for-sale, Amortized Cost | 428,432 | 289,712 |
Debt Securities, Available-for-Sale, Current | 426,926 | 284,621 |
Equity Method Investments Excluded From Fair Value | 0 | 177 |
Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 131,101 | 157,020 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,171 | 247 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,687 | 5,351 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 132,617 | 162,124 |
Fixed Income Investments And Other Investments [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,687 |  |
Commercial Mortgage Backed Securities [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 1,819 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 9 | 34 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,827 |  |
Short-term Investments [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 295,825 | 127,601 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10 | 13 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 295,815 | 127,588 |
Asset-backed Securities [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,298 | 5,061 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 24 | 14 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 2 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,274 | 5,049 |
Collateralized Debt Obligations [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,319 | 3,142 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 15 | 13 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 2 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,304 | 3,131 |
Residential Mortgage-Backed Securities [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 3,294 | 2,446 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 43 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 14 | 29 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,265 | 2,475 |
US Government Debt Securities [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 39,171 | 40,995 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 398 | 98 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 205 | 809 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 38,978 | 41,706 |
Corporate Debt Securities [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 70,690 | 89,192 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 590 | 107 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,180 | 3,905 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 72,280 | 92,990 |
Municipal Bonds [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 11,510 | 14,083 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 100 | 7 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 279 | 570 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 11,689 | 14,646 |
Collateralized Mortgage Backed Securities [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 1,819 | 2,101 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 8 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 9 | 34 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,827 | 2,127 |
Total Fair Value [Member] |  |  |
Financial assets: |  |  |
Cash | 51,767 | 47,275 |
Reported Value Measurement [Member] |  |  |
Financial assets: |  |  |
Cash | 51,767 | 47,275 |
Loans | 0 | 3,434 |
Total financial assets | 507,373 | 363,624 |
Short-Term Debt | 0 | 152,560 |
Financial liabilities: |  |  |
Total financial liabilities | 0 | 152,877 |
Reported Value Measurement [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 295,825 | 127,601 |
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 28,302 | 28,294 |
Reported Value Measurement [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Reported Value Measurement [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 378 | 0 |
Level 1 [Member] |  |  |
Financial assets: |  |  |
Cash | 51,767 | 47,275 |
Total financial assets | 386,763 | 215,871 |
Short-Term Debt | 0 | 0 |
Financial liabilities: |  |  |
Total financial liabilities | 0 | 0 |
Level 1 [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 295,825 | 127,601 |
Level 1 [Member] | Loans Receivable [Member] |  |  |
Financial assets: |  |  |
Loans | 0 | 0 |
Level 1 [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 0 | 0 |
Level 1 [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 0 |
Level 1 [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 0 | 0 |
Level 2 [Member] |  |  |
Financial assets: |  |  |
Cash | 0 | 0 |
Total financial assets | 92,308 | 116,025 |
Short-Term Debt | 0 | 0 |
Financial liabilities: |  |  |
Total financial liabilities | 0 | 317 |
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] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 0 | 0 |
Level 2 [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Level 2 [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 378 | 0 |
Level 3 [Member] |  |  |
Financial assets: |  |  |
Cash | 0 | 0 |
Total financial assets | 0 | 3,434 |
Short-Term Debt | 0 | 152,560 |
Financial liabilities: |  |  |
Total financial liabilities | 0 | 152,560 |
Level 3 [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 0 | 0 |
Level 3 [Member] | Loans Receivable [Member] |  |  |
Financial assets: |  |  |
Loans | 0 | 3,434 |
Level 3 [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 0 | 0 |
Level 3 [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 0 |
Level 3 [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 0 | 0 |
Commercial Mortgage Backed Securities [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 1,819 | 2,101 |
Municipal Bonds [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 11,510 | 14,083 |
Corporate Debt Securities [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 70,690 | 89,192 |
US Government Debt Securities [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 39,171 | 40,995 |
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 3,294 | 2,446 |
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,319 | 3,142 |
Asset-backed Securities [Member] | Reported Value Measurement [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,298 | 5,061 |
Fair Value, Recurring [Member] |  |  |
Financial assets: |  |  |
Total financial assets | 486,756 | 342,829 |
Short-Term Debt | 0 | 152,560 |
Financial liabilities: |  |  |
Total financial liabilities | 0 | 152,877 |
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 1,819 | 2,101 |
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 295,825 | 127,601 |
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |  |
Financial assets: |  |  |
Loans | 0 | 3,434 |
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 7,685 | 7,499 |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,298 | 5,061 |
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,319 | 3,142 |
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 3,294 | 2,446 |
Fair Value, Recurring [Member] | US Government Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 39,171 | 40,995 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 70,690 | 89,192 |
Fair Value, Recurring [Member] | Municipal Bonds [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 11,510 | 14,083 |
Fair Value, Recurring [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Fair Value, Recurring [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 378 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 39,171 | 40,995 |
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 1,819 | 2,101 |
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,298 | 5,061 |
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 2,319 | 3,142 |
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 3,294 | 2,446 |
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 70,690 | 89,192 |
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 11,510 | 14,083 |
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | $ 0 | $ 0 |

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