v3.26.1
Components of Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Components of Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance $ 295,587 $ 429,666
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1,027 3,695
Amounts reclassified from AOCI, net of tax 3,761 4,419
Total other comprehensive income (loss) 4,788 8,114
Less: OCI attributable to noncontrolling interests (80) (367)
Ending balance 274,911 432,533
Cumulative Foreign Exchange Translation Adjustments    
Components of Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (199,071) (229,257)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6,378) 15,101
Amounts reclassified from AOCI, net of tax 0 0
Total other comprehensive income (loss) (6,378) 15,101
Less: OCI attributable to noncontrolling interests (80) (367)
OCI attributable to Enviri Corporation (6,458) 14,734
Ending balance (205,529) (214,523)
Effective Portion of Derivatives Designated as Hedging Instruments    
Components of Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance 15 3,769
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1,912 (2,824)
Amounts reclassified from AOCI, net of tax (656) 27
Total other comprehensive income (loss) 1,256 (2,797)
Less: OCI attributable to noncontrolling interests 0 0
OCI attributable to Enviri Corporation 1,256 (2,797)
Ending balance 1,271 972
Cumulative Unrecognized Actuarial Losses on Pension Obligations    
Components of Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (315,450) (311,919)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 5,493 (8,580)
Amounts reclassified from AOCI, net of tax 4,417 4,392
Total other comprehensive income (loss) 9,910 (4,188)
Less: OCI attributable to noncontrolling interests 0 0
OCI attributable to Enviri Corporation 9,910 (4,188)
Ending balance (305,540) (316,107)
Unrealized Gain (Loss) on Marketable Securities    
Components of Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance 25 22
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 (2)
Amounts reclassified from AOCI, net of tax 0 0
Total other comprehensive income (loss) 0 (2)
Less: OCI attributable to noncontrolling interests 0 0
OCI attributable to Enviri Corporation 0 (2)
Ending balance 25 20
Accumulated Other Comprehensive Loss    
Components of Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (514,481) (537,385)
Total other comprehensive income (loss) 4,708 7,747
OCI attributable to Enviri Corporation 4,708 7,747
Ending balance $ (509,773) $ (529,638)