Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Premiums Written, Net	$ 73,898	$ 88,682	$ 79,825
Net premiums earned	67,232	99,005	51,911
Commissions	143,381	92,023	51,281
Insurance Agency Management Fee	20,419	6,353
Program fees	14,322	13,506	8,437
Net Investment Income	10,647	14,448	13,159
Net gains (losses) on derivative contracts	1,019	4,016	(279)
Other	(4,780)	10,480	(60)
Loss and loss adjustment expenses	47,193	72,626	36,712
Policy acquisition costs	15,790	23,666	10,557
Commissions	37,037	40,876	29,465
General and Administrative Expense	191,624	129,166	66,985
Amortization of intangible assets	38,044	17,602	4,152
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(101,014)	(59,845)	(24,221)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(95,803)	(58,921)	(23,232)
Discontinued operations	(163,288)	(497,167)	28,183
Net income (loss)	$ (259,091)	$ (556,088)	$ 4,951
Earnings Per Share, Basic	$ (5.93)	$ (11.96)	$ 0.18
Diluted	$ (5.93)	$ (11.96)	$ 0.18
Net income (loss) attributable to shareholders	$ (261,692)	$ (556,449)	$ 3,632
Adjustment for Redeemable NCI	(18,175)	(5,222)	4,792
Noncontrolling interest	$ (2,601)	$ (361)	$ (1,319)
Income (Loss) from Continuing Operations, Per Basic Share	$ (2.47)	$ (1.37)	$ (0.43)
Income (Loss) from Continuing Operations, Per Diluted Share	(2.47)	(1.37)	(0.43)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(3.46)	(10.58)	0.62
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ (3.46)	$ (10.58)	$ 0.62
Numerator of basic and diluted EPS	$ (116,579)	$ (64,504)	$ (19,759)
Net income (loss) attributable to Octave common stockholders	$ (98,404)	$ (59,282)	$ (24,551)