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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Details) - USD ($) $ 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
Revenues: |  |  |  |  |  |  |  |  |  |  |
Other revenue | $ 7,235 | $ 6,422 | $ (426) | $ 83 | $ 67 | $ (5) | $ 101 | $ 37 | $ 13,314 | $ 200 | $ 577
Net investment gains (losses), including impairments | 4,455 | 577 | (4,535) | 0 | (1) | 0 | 20 | (38) | 497 | (19) | 62
Total revenues and other income |  |  |  |  |  |  |  |  | 235,815 | 124,728 | 53,612
General and Administrative Expense | 40,444 | 44,681 | 28,336 | 18,050 | 21,193 | 17,914 | 17,117 | 11,839 | 129,166 | 66,985 | 56,278
Expenses: |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 924 | 989 | 462
Net income (loss) | (548,265) | (27,504) | (750) | 20,070 | (15,688) | 65,869 | (13,132) | (33,417) | (556,088) | 4,951 | 522,120
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total | (20,943) | (19,890) | (14,719) | (3,369) | (9,099) | (4,595) | (8,725) | (813) | (58,921) | (23,232) | (35,244)
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | (939) | 51,184 | (225,341)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  |  |  |  |  |  |  |  | (22,156) | 40,132 | (84,520)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax |  |  |  |  |  |  |  |  | (356) | (88) | 340
Total other comprehensive income (loss), net of income tax |  |  |  |  |  |  |  |  | (28,390) | 92,797 | (310,454)
Total comprehensive income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | (581,765) | 96,429 | 211,926
Net gains (losses) on derivative contracts | $ (2,043) | $ 6,545 | $ (438) | $ (48) | $ 69 | $ (27) | $ (146) | $ (175) | 4,016 | (279) | 935
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | 1,295 | 2,095 | (6,264)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, Tax |  |  |  |  |  |  |  |  | (118) | 177 | 79
Revenues: |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 7,262 | 9,298 | 10,389
Other revenue |  |  |  |  |  |  |  |  | (415) | 6 | (81)
Net investment gains (losses), including impairments |  |  |  |  |  |  |  |  | 498 | (55) | 13,664
Total revenues and other income |  |  |  |  |  |  |  |  | 10,259 | 9,011 | (2,421)
General and Administrative Expense |  |  |  |  |  |  |  |  | 41,519 | 21,597 | 17,435
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | 41,519 | 21,597 | 17,435
Pretax income (loss) from continuing operations |  |  |  |  |  |  |  |  | (31,260) | (12,586) | (19,856)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,748 | 1,193 | 462
Income (loss) before equity pick-up of net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 29,512 | 11,393 | 19,394
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (526,937) | 15,026 | 541,773
Net income (loss) |  |  |  |  |  |  |  |  | (556,449) | 3,633 | 522,379
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  | (556,449) | 3,632 | 522,380
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | (939) | 51,184 | (225,341)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  |  |  |  |  |  |  |  | (22,156) | 40,132 | (84,520)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax |  |  |  |  |  |  |  |  | (356) | (88) | 340
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  |  | (4,939) | 1,569 | (933)
Total other comprehensive income (loss), net of income tax |  |  |  |  |  |  |  |  | (28,390) | 92,797 | (310,454)
Total comprehensive income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | (584,839) | 96,430 | 211,925
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net gains (losses) on derivative contracts |  |  |  |  |  |  |  |  | $ 3,910 | $ (348) | $ 935

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