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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 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | $ 264,055 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,439 | 260 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,286 | 5,351 |
Financial assets: |  |  |
Derivative assets | 790 | 0 |
Other assets | 0 |  |
Short-Term Debt | 150,000 | 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 | 265,902 | 289,712 |
Debt Securities, Available-for-Sale, Current | 264,055 | 284,621 |
Equity Method Investments Excluded From Fair Value | 89 | 177 |
Fixed Income Securities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 161,335 | 157,020 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,438 | 247 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,286 | 5,351 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 163,183 | 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 | 3,286 |  |
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 | 1,920 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 17 | 34 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,935 |  |
Short-term Investments [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Debt Securities, Available-for-Sale | 102,720 | 127,601 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 13 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 102,719 | 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 | 2,561 | 5,061 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 19 | 14 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2 | 2 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,544 | 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 | 2,652 | 3,142 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11 | 13 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1 | 2 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,642 | 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 | 3,362 | 2,446 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 28 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 18 | 29 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,352 | 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 | 44,432 | 40,995 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 496 | 98 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 308 | 809 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 44,244 | 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 | 92,100 | 89,192 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 773 | 107 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,599 | 3,905 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 93,926 | 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 | 14,308 | 14,083 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 109 | 7 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 341 | 570 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 14,540 | 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 | 1,920 | 2,101 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 8 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 17 | 34 |
Financial liabilities: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,935 | 2,127 |
Total Fair Value [Member] |  |  |
Financial assets: |  |  |
Cash | 47,085 | 47,276 |
Reported Value Measurement [Member] |  |  |
Financial assets: |  |  |
Cash | 47,085 | 47,276 |
Loans | 3,503 | 3,434 |
Total financial assets | 343,626 | 363,625 |
Short-Term Debt | 152,944 | 152,560 |
Financial liabilities: |  |  |
Total financial liabilities | 152,944 | 152,877 |
Reported Value Measurement [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 102,720 | 127,601 |
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 28,193 | 28,294 |
Reported Value Measurement [Member] | Warrants [Member] |  |  |
Financial assets: |  |  |
Derivative assets | 0 | 0 |
Reported Value Measurement [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Reported Value Measurement [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 790 | 0 |
Level 1 [Member] |  |  |
Financial assets: |  |  |
Cash | 47,085 | 47,276 |
Total financial assets | 194,326 | 215,872 |
Short-Term Debt | 152,944 | 0 |
Financial liabilities: |  |  |
Total financial liabilities | 152,944 | 0 |
Level 1 [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 102,720 | 127,601 |
Level 1 [Member] | Loans Receivable [Member] |  |  |
Financial assets: |  |  |
Loans | 0 | 0 |
Level 1 [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 89 | 0 |
Level 1 [Member] | Warrants [Member] |  |  |
Financial assets: |  |  |
Derivative assets | 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 | 117,693 | 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] | Warrants [Member] |  |  |
Financial assets: |  |  |
Derivative assets | 0 | 0 |
Level 2 [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Level 2 [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 790 | 0 |
Level 3 [Member] |  |  |
Financial assets: |  |  |
Cash | 0 | 0 |
Total financial assets | 3,503 | 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 | 3,503 | 3,434 |
Level 3 [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 0 | 0 |
Level 3 [Member] | Warrants [Member] |  |  |
Financial assets: |  |  |
Derivative assets | 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 | 1,920 | 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 | 14,308 | 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 | 92,100 | 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 | 44,432 | 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 | 3,362 | 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 | 2,652 | 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 | 2,561 | 5,061 |
Fair Value, Recurring [Member] |  |  |
Financial assets: |  |  |
Total financial assets | 322,919 | 342,830 |
Short-Term Debt | 152,944 | 152,560 |
Financial liabilities: |  |  |
Total financial liabilities | 152,944 | 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 | 1,920 | 2,101 |
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |
Financial assets: |  |  |
Short term investments | 102,720 | 127,601 |
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |  |
Financial assets: |  |  |
Loans | 3,503 | 3,434 |
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |  |
Financial assets: |  |  |
Other investments | 7,486 | 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 | 2,561 | 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 | 2,652 | 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 | 3,362 | 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 | 44,432 | 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 | 92,100 | 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 | 14,308 | 14,083 |
Fair Value, Recurring [Member] | Warrants [Member] |  |  |
Financial assets: |  |  |
Derivative assets | 0 | 0 |
Fair Value, Recurring [Member] | Foreign Exchange Future |  |  |
Financial liabilities: |  |  |
Derivative liabilities | 0 | 317 |
Fair Value, Recurring [Member] | Foreign Exchange Forward |  |  |
Financial assets: |  |  |
Derivative assets | 790 | 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 | 44,432 | 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 | 1,920 | 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 | 2,561 | 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 | 2,652 | 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 | 3,362 | 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 | 92,100 | 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 | 14,308 | 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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