CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues from continuing operations:
Total revenues	$ 2,240,358	$ 2,343,137	$ 2,366,187
Costs and expenses from continuing operations:
Selling, general and administrative costs	382,005	359,388	353,985
Research and development expenses	3,050	3,961	3,458
Goodwill and other intangible asset impairment charges	0	15,866	0
Property, plant and equipment impairment charge	7,797	23,444	14,099
Remeasurement of long-lived assets	0	10,695	0
Gain (Loss) on Disposition of Business	0	(10,478)	0
Other expenses	30,002	5,437	(1,591)
Total costs and expenses	2,236,109	2,312,423	2,278,674
Operating income (loss) from continuing operations	4,249	30,714	87,513
Interest income	2,191	6,795	6,809
Interest expense	(110,962)	(112,217)	(107,081)
Facility fees and debt-related income (expense)	(10,662)	(11,265)	(10,762)
Defined benefit pension income (expense)	(21,635)	(17,607)	(22,326)
Income (loss) from continuing operations before income taxes and equity income	(136,819)	(103,580)	(45,847)
Income tax expense	(22,986)	(16,834)	(34,530)
Equity in income (loss) of unconsolidated entities, net	155	(10)	(761)
Income (loss) from continuing operations	(159,650)	(120,424)	(81,138)
Discontinued operations:
Income (loss) from discontinued businesses	(5,494)	(5,297)	(5,133)
Income tax benefit (expense) from discontinued businesses	1,435	1,382	1,332
Income (loss) from discontinued operations, net of tax	(4,059)	(3,915)	(3,801)
Net income (loss)	(163,709)	(124,339)	(84,939)
Less: Net income attributable to noncontrolling interests	(3,892)	(5,312)	1,977
Net income (loss) attributable to Enviri Corporation	(167,601)	(129,651)	(82,962)
Amounts attributable to Harsco Corporation common stockholders:
Income (loss) from continuing operations, net of tax	(163,542)	(125,736)	(79,161)
Income (loss) from discontinued operations, net of tax	(4,059)	(3,915)	(3,801)
Net income (loss) attributable to Enviri Corporation	$ (167,601)	$ (129,651)	$ (82,962)
Weighted average shares of common stock outstanding	80,712	80,118	79,796
Basic earnings (loss) per share attributable to Enviri Corporation common stockholders:
Continuing operations (in dollars per share)	$ (2.03)	$ (1.57)	$ (0.99)
Discontinued operations (in dollars per share)	(0.05)	(0.05)	(0.05)
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (2.08)	$ (1.62)	$ (1.04)
Diluted weighted average shares of stock outstanding	80,712	80,118	79,796
Diluted earnings (loss) per share attributable to Enviri Corporation common stockholders:
Continuing operations (in dollars per share)	$ (2.03)	$ (1.57)	$ (0.99)
Discontinued operations (in dollars per share)	(0.05)	(0.05)	(0.05)
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (2.08)	$ (1.62)	$ (1.04)
Service revenues
Revenues from continuing operations:
Total revenues	$ 1,988,144	$ 1,977,781	$ 1,930,848
Costs and expenses from continuing operations:
Cost of services and products sold	1,547,681	1,563,391	1,511,097
Total costs and expenses		2,312,423	2,278,674
Product revenues
Revenues from continuing operations:
Total revenues	252,214	365,356	435,339
Costs and expenses from continuing operations:
Cost of services and products sold	$ 265,574	$ 340,719	$ 397,626