Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Balance at the beginning of the period		$ 759,253	$ 883,109
Goodwill, Impairment Loss			(104,580)
Foreign currency translation		8,699	(19,276)
Balance at the end of the period		767,952	759,253
Harsco Environmental
Goodwill [Roll Forward]
Balance at the beginning of the period		379,954	399,230
Goodwill, Impairment Loss			0
Foreign currency translation		8,699	(19,276)
Balance at the end of the period		388,653	379,954
Clean Earth
Goodwill [Roll Forward]
Balance at the beginning of the period		379,299	483,879
Goodwill, Impairment Loss	$ (104,600)		(104,580)
Foreign currency translation		0	0
Balance at the end of the period		$ 379,299	$ 379,299