v3.26.1
Basis of Presentation - Revision of Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net income (loss) $ (9,538) $ (7,812)
Other comprehensive income (loss):    
Foreign currency translation adjustments, net of deferred income taxes (6,378) 15,101
Pension liability adjustments, net of deferred income taxes 9,910 (4,188)
Total other comprehensive income 4,788 8,114
Total comprehensive income (loss) (4,750) 302
Comprehensive income (loss) attributable to Enviri Corporation $ (5,957) (1,266)
As Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net income (loss)   (12,195)
Other comprehensive income (loss):    
Foreign currency translation adjustments, net of deferred income taxes   15,723
Pension liability adjustments, net of deferred income taxes   (4,206)
Total other comprehensive income   8,718
Total comprehensive income (loss)   (3,477)
Comprehensive income (loss) attributable to Enviri Corporation   (5,045)
Revision    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net income (loss)   4,383
Other comprehensive income (loss):    
Foreign currency translation adjustments, net of deferred income taxes   (622)
Pension liability adjustments, net of deferred income taxes   18
Total other comprehensive income   (604)
Total comprehensive income (loss)   3,779
Comprehensive income (loss) attributable to Enviri Corporation   $ 3,779