Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 653,913	$ 630,354
China
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	108,496	$ 109,617
Harsco Environmental | China
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 20,000