Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net gains	$ (6,629)	$ (2,561)	$ (4,013)
Employee termination benefit costs	8,353	3,006	8,215
Costs to exit activities	(1,546)	(1,565)	5,449
Impaired asset write-downs	5,259	88	736
Contingent Consideration Adjustments	0	(848)	(827)
Other expense	0	289	2,094
Total	5,437	(1,591)	11,654
Gain (Loss) on Disposition of Business	(10,478)	0	0
Business Exit Costs (Gain)		(8,100)
Corporate
Segment Reporting Information [Line Items]
Net gains	(3,272)	0	(632)
Employee termination benefit costs	1,179	275	(294)
Costs to exit activities	2,060	2,669	1,407
Contingent Consideration Adjustments	0	(848)	0
Harsco Environmental
Segment Reporting Information [Line Items]
Net gains	(3,357)	(250)	(1,869)
Employee termination benefit costs	6,013	1,977	4,998
Costs to exit activities	(3,615)	(7,810)	39
Impaired asset write-downs	2,771	88	582
Clean Earth
Segment Reporting Information [Line Items]
Net gains	0	0	(1,512)
Employee termination benefit costs	521	1,399	1,786
Costs to exit activities	0	0	0
Impaired asset write-downs	567	0	59
Contingent Consideration Adjustments	0	0	(827)
Harsco Rail
Segment Reporting Information [Line Items]
Net gains	0	(2,311)	0
Employee termination benefit costs	640	(645)	1,725
Costs to exit activities	9	3,576	4,003
Impaired asset write-downs	$ 1,921	$ 0	$ 95