v3.26.1
Basis of Presentation - Revision of Statements of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenues from continuing operations:    
Total revenues $ 549,803 $ 547,907
Costs and expenses from continuing operations:    
Total costs and expenses 549,010 518,646
Operating income (loss) from continuing operations 793 29,261
Defined benefit pension income (expense) (3,936) (5,201)
Income (loss) from continuing operations before income taxes and equity in income (32,797) (4,672)
Income tax benefit (expense) from continuing operations 24,387 (2,001)
Net income (loss) (9,538) (7,812)
Net income (loss) attributable to Enviri Corporation (10,665) (9,013)
Amounts attributable to Enviri Corporation common stockholders:    
Income (loss) from continuing operations, net of tax (9,514) (7,846)
Net income (loss) attributable to Enviri Corporation $ (10,665) $ (9,013)
Basic earnings (loss) per common share attributable to Enviri Corporation common stockholders:    
Continuing operations (in dollars per share) $ (0.12) $ (0.10)
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share) (0.13) (0.11)
Diluted earnings (loss) per common share attributable to Enviri Corporation common stockholders:    
Continuing operations (in dollars per share) (0.12) (0.10)
Diluted earnings (loss) per share attributable to Enviri Corporation common stockholders (in dollars per share) $ (0.13) $ (0.11)
As Previously Reported    
Revenues from continuing operations:    
Total revenues   $ 548,284
Costs and expenses from continuing operations:    
Total costs and expenses   517,629
Operating income (loss) from continuing operations   30,655
Defined benefit pension income (expense)   (5,033)
Income (loss) from continuing operations before income taxes and equity in income   (3,110)
Income tax benefit (expense) from continuing operations   (7,946)
Net income (loss)   (12,195)
Net income (loss) attributable to Enviri Corporation   (13,396)
Amounts attributable to Enviri Corporation common stockholders:    
Income (loss) from continuing operations, net of tax   (12,229)
Net income (loss) attributable to Enviri Corporation   $ (13,396)
Basic earnings (loss) per common share attributable to Enviri Corporation common stockholders:    
Continuing operations (in dollars per share)   $ (0.15)
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)   (0.17)
Diluted earnings (loss) per common share attributable to Enviri Corporation common stockholders:    
Continuing operations (in dollars per share)   (0.15)
Diluted earnings (loss) per share attributable to Enviri Corporation common stockholders (in dollars per share)   $ (0.17)
Revision    
Revenues from continuing operations:    
Total revenues   $ (377)
Costs and expenses from continuing operations:    
Total costs and expenses   1,017
Operating income (loss) from continuing operations   (1,394)
Defined benefit pension income (expense)   (168)
Income (loss) from continuing operations before income taxes and equity in income   (1,562)
Income tax benefit (expense) from continuing operations   5,945
Net income (loss)   4,383
Net income (loss) attributable to Enviri Corporation   4,383
Amounts attributable to Enviri Corporation common stockholders:    
Income (loss) from continuing operations, net of tax   4,383
Net income (loss) attributable to Enviri Corporation   $ 4,383
Basic earnings (loss) per common share attributable to Enviri Corporation common stockholders:    
Continuing operations (in dollars per share)   $ 0.05
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)   0.05
Diluted earnings (loss) per common share attributable to Enviri Corporation common stockholders:    
Continuing operations (in dollars per share)   0.05
Diluted earnings (loss) per share attributable to Enviri Corporation common stockholders (in dollars per share)   $ 0.05
Service Revenues    
Revenues from continuing operations:    
Total revenues $ 484,025 $ 476,463
Costs and expenses from continuing operations:    
Cost of services and products sold 381,964 372,402
Service Revenues | As Previously Reported    
Revenues from continuing operations:    
Total revenues   476,840
Service Revenues | Revision    
Revenues from continuing operations:    
Total revenues   (377)
Product Revenues    
Revenues from continuing operations:    
Total revenues 65,778 71,444
Costs and expenses from continuing operations:    
Cost of services and products sold $ 62,264 52,378
Product Revenues | As Previously Reported    
Costs and expenses from continuing operations:    
Cost of services and products sold   51,361
Product Revenues | Revision    
Costs and expenses from continuing operations:    
Cost of services and products sold   $ 1,017