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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Enviri Corporation common stockholders	$ (14,208)	$ (106,700)	$ (23,765)	$ (114,033)
Weighted-average shares outstanding - basic (in shares)	79,816	79,509	79,725	79,437
Dilutive effect of stock-based compensation (in shares)	0	0	0	0
Weighted-average shares outstanding - diluted (in shares)	79,816	79,509	79,725	79,437
Earnings (loss) from continuing operations per common share, attributable to Enviri Corporation common stockholders:
Basic (in dollars per share)	$ (0.18)	$ (1.34)	$ (0.30)	$ (1.44)
Diluted (in dollars per share)	$ (0.18)	$ (1.34)	$ (0.30)	$ (1.44)