Acquisitions and Dispositions - Assets and Liabilities Held For Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Total liabilities	$ 0	$ 11,344
Discontinued Operations, Held-for-sale [Member] | Harsco Industrial
Business Acquisition [Line Items]
Trade accounts receivable, net		10,982
Other receivables		78
Inventories		9,838
Other current assets		655
Property, plant and equipment, net		20,703
Right-of-use assets, net		11,230
Other assets		96
Total assets		53,582
Accounts payable		5,060
Accrued compensation		2,324
Current portion of advances on contracts		1,168
Current portion of operating lease liabilities		1,575
Other current liabilities		1,218
Operating lease liabilities		9,837
Other liabilities		2,314
Total liabilities		$ 23,496