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Reconciliation of Basic and Diluted Shares - Reconciliation of Basic and Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Enviri Corporation common stockholders	$ (21,133)	$ (11,995)	$ (80,312)	$ (41,556)
Weighted-average shares outstanding - basic (in shares)	80,665	80,165	80,543	80,085
Dilutive effect of stock-based compensation (in shares)	0	0	0	0
Weighted-average shares outstanding - diluted (in shares)	80,665	80,165	80,543	80,085
Earnings (loss) from continuing operations per common share, attributable to Enviri Corporation common stockholders:
Basic (in dollars per share)	$ (0.26)	$ (0.15)	$ (1.00)	$ (0.52)
Diluted (in dollars per share)	$ (0.26)	$ (0.15)	$ (1.00)	$ (0.52)

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