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Net Income Per Share - Reconciliation of Net Income (Loss) Attributable to Common Stockholders to the Numerator in the Basic and Diluted Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Ambac common stockholders |  |  |  |  |  |  |  |  | $ (59,282) | $ (24,551) | $ (36,115)
Adjustment to redemption value (ASC 480) | $ 55,762 | $ (2,402) | $ (184) | $ 53 | $ 4,855 | $ 19 | $ (294) | $ 212 | $ 53,210 | $ 4,792 | $ 2,469
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.70 | $ (0.43) | $ (0.33) | $ (0.09) | $ (0.10) | $ (0.11) | $ (0.20) | $ (0.03) | $ (0.13) | $ (0.43) | $ (0.74)
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.70 | $ (0.43) | $ (0.33) | $ (0.09) | $ (0.10) | $ (0.11) | $ (0.20) | $ (0.03) | $ (0.13) | $ (0.43) | $ (0.74)
Numerator of basic and diluted EPS | $ (492,503) | $ (29,906) | $ (934) | $ 20,123 | $ (10,833) | $ 65,888 | $ (13,426) | $ (33,205) | $ (6,072) | $ (19,759) | $ (33,646)

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