Consolidated Statements of Total Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Net premiums earned	$ 99,005	$ 51,911	$ 13,869
Commission income	92,023	51,281	30,695
Program fees	13,506	8,437	3,095
Net investment income:
Net investment income	14,448	13,159	4,503
Realized Investment Gains (Losses)	(497)	19	(62)
Net gains (losses) on derivative contracts	4,016	(279)	935
Net realized gains on extinguishment of debt	(497)	19	(13,710)
Other revenue	13,314	200	577
Total revenues and other income	235,815	124,728	53,612
Loss and loss adjustment expenses (benefit)	72,626	36,712	9,071
Expenses:
Policy acquisition costs	23,666	10,557	2,535
Commission expenses	40,876	29,465	17,641
Intangible amortization	17,602	4,152	2,921
General and Administrative Expense	129,166	66,985	56,278
Depreciation expense	2,345	1,078	872
Interest expense	9,379	0	0
Total expenses	295,660	148,949	89,318
Pretax income (loss) from continuing operations	(59,845)	(24,221)	(35,706)
Provision (benefit) for income taxes from continuing operations	(924)	(989)	(462)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(58,921)	(23,232)	(35,244)
Noncontrolling interest	(361)	(1,319)	(871)
Discontinued operations	(497,167)	28,183	557,364
Net income (loss)	(556,088)	4,951	522,120
AMPS Gain on Purchase of Shares			1,131
Net income (loss) attributable to Ambac shareholders	(556,449)	3,632	522,380
Other comprehensive income (loss), after tax
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(58,921)	(23,232)	(35,244)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax	(356)	(88)	340
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after 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), net of income tax	(584,478)	97,748	211,666
Less: net (gain) loss attributable to noncontrolling interest
Total comprehensive income (loss) attributable to Ambac shareholders	$ (581,765)	$ 96,429	$ 211,926
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.13)	$ (0.43)	$ (0.74)
Income (Loss) from Continuing Operations, Per Diluted Share	(0.13)	(0.43)	(0.74)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(10.58)	0.62	12.22
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(10.58)	0.62	12.22
Basic	(10.71)	0.18	11.48
Diluted	$ (10.71)	$ 0.18	$ 11.48
Weighted Average Number of Shares Outstanding, Basic	46,969,708	45,636,649	45,719,906
Weighted Average Number of Shares Outstanding, Diluted	46,969,708	45,636,649	45,719,906
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	$ (361)	$ (1,319)	$ (871)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	3,074
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	(939)	51,184	(225,341)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(22,156)	40,132	(84,520)
Net income (loss) from discontinued operations	(497,167)	28,183	558,495
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	$ (59,282)	$ (24,551)	$ (36,115)