Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 780,978	$ 772,279
Goodwill, Impairment Loss	(13,026)
Foreign currency translation	(9,163)	8,699
Balance at the end of the period	739,758	780,978	$ 772,279
Changes to goodwill	(19,031)
Harsco Environmental
Goodwill [Roll Forward]
Balance at the beginning of the period	388,653	379,954
Goodwill, Impairment Loss	0
Foreign currency translation	(9,163)	8,699
Balance at the end of the period	360,459	388,653	379,954
Changes to goodwill	(19,031)
Clean Earth
Goodwill [Roll Forward]
Balance at the beginning of the period	379,299	379,299
Goodwill, Impairment Loss	0
Foreign currency translation	0	0
Balance at the end of the period	379,299	379,299	379,299
Changes to goodwill	0
Harsco Rail
Goodwill [Roll Forward]
Balance at the beginning of the period	13,026	13,026
Goodwill, Impairment Loss	(13,026)		(104,600)
Foreign currency translation	0	0
Balance at the end of the period	0	$ 13,026	$ 13,026
Changes to goodwill	$ 0