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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Enviri Corporation common stockholders	$ (8,495)	$ 625	$ (32,260)	$ (113,408)
Weighted-average shares outstanding - basic (in shares)	79,850	79,531	79,767	79,469
Dilutive effect of stock-based compensation (in shares)	0	36	0	0
Weighted-average shares outstanding - diluted (in shares)	79,850	79,567	79,767	79,469
Earnings (loss) from continuing operations per common share, attributable to Enviri Corporation common stockholders:
Basic (in dollars per share)	$ (0.11)	$ 0.01	$ (0.40)	$ (1.43)
Diluted (in dollars per share)	$ (0.11)	$ 0.01	$ (0.40)	$ (1.43)