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Components of Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of Accumulated Other Comprehensive Income [Roll Forward]                
Beginning balance $ 417,831 $ 448,687 $ 449,599 $ 528,798 $ 546,124 $ 575,408 $ 449,599 $ 575,408
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax             5,600 (17,878)
Amounts reclassified from AOCI, net of tax             14,758 12,177
Total other comprehensive income (loss) 1,607 10,033 8,718 8,198 (6,240) (7,659) 20,358 (5,701)
Less: OCI attributable to noncontrolling interests             (1,355) (225)
Ending balance 403,805 417,831 448,687 525,879 528,798 546,124 403,805 525,879
Cumulative Foreign Exchange Translation Adjustments                
Components of Accumulated Other Comprehensive Income [Roll Forward]                
Beginning balance     (228,698)     (183,499) (228,698) (183,499)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax             29,337 (4,355)
Amounts reclassified from AOCI, net of tax             0 0
Total other comprehensive income (loss)             29,337 (4,355)
Less: OCI attributable to noncontrolling interests             (1,355) (225)
OCI attributable to Enviri Corporation             27,982 (4,580)
Ending balance (200,716)     (188,079)     (200,716) (188,079)
Effective Portion of Derivatives Designated as Hedging Instruments                
Components of Accumulated Other Comprehensive Income [Roll Forward]                
Beginning balance     3,769     (470) 3,769 (470)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax             (4,935) 304
Amounts reclassified from AOCI, net of tax             909 (1,983)
Total other comprehensive income (loss)             (4,026) (1,679)
Less: OCI attributable to noncontrolling interests             0 0
OCI attributable to Enviri Corporation             (4,026) (1,679)
Ending balance (257)     (2,149)     (257) (2,149)
Cumulative Unrecognized Actuarial Losses on Pension Obligations                
Components of Accumulated Other Comprehensive Income [Roll Forward]                
Beginning balance     (314,057)     (355,740) (314,057) (355,740)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax             (18,803) (13,832)
Amounts reclassified from AOCI, net of tax             13,849 14,160
Total other comprehensive income (loss)             (4,954) 328
Less: OCI attributable to noncontrolling interests             0 0
OCI attributable to Enviri Corporation             (4,954) 328
Ending balance (319,011)     (355,412)     (319,011) (355,412)
Unrealized Gain (Loss) on Marketable Securities                
Components of Accumulated Other Comprehensive Income [Roll Forward]                
Beginning balance     22     15 22 15
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax             1 5
Amounts reclassified from AOCI, net of tax             0 0
Total other comprehensive income (loss)             1 5
Less: OCI attributable to noncontrolling interests             0 0
OCI attributable to Enviri Corporation             1 5
Ending balance 23     20     23 20
Accumulated Other Comprehensive Loss                
Components of Accumulated Other Comprehensive Income [Roll Forward]                
Beginning balance (521,368) (530,613) (538,964) (552,548) (546,532) (539,694) (538,964) (539,694)
Total other comprehensive income (loss) 1,407 9,245 8,351 6,928 (6,016) (6,838)    
OCI attributable to Enviri Corporation             19,003 (5,926)
Ending balance $ (519,961) $ (521,368) $ (530,613) $ (545,620) $ (552,548) $ (546,532) $ (519,961) $ (545,620)