Goodwill and Other Intangible Assets- Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 13,026
Goodwill	$ 758,680	739,758	$ 780,978
Impaired asset write-downs	768	$ 5,259	88
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]		Goodwill and other intangible asset impairment charges
Clean Earth
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 0
Goodwill	379,299	379,299	379,299
Impaired asset write-downs	0	567	0
Harsco Environmental
Goodwill [Line Items]
Goodwill, Impairment Loss		0
Goodwill	379,381	360,459	388,653
Impaired asset write-downs	$ 583	$ 2,771	$ 88