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Acquisitions and Dispositions - Summary of Key Financial Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Income (loss) from discontinued businesses   $ 18,281 $ 569,135 $ 0
Income (loss) from discontinued business   (2,745) 27,531 43,942
Loss on early extinguishment of debt   0 5,314 0
Air-cooled heat exchangers        
Business Acquisition [Line Items]        
Loss on early extinguishment of debt     (5,300)  
Harsco Industrial | Discontinued Operations, Held-for-sale [Member]        
Business Acquisition [Line Items]        
Total revenues   10,203 306,972 374,707
Cost of products sold   8,082 224,811 276,198
Income (loss) from discontinued businesses   18,281 569,135 0
Income (loss) from discontinued business   (1,578) 27,823 43,593
Disposal Group, Including Discontinued Operation, General and Administrative Expense   2,695 8,429 0
Disposal Group, Including Discontinued Operation, Interest Expense   0 11,237 16,613
Loss on early extinguishment of debt   $ 0 (5,314) $ 0
Interest rate swaps | Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member]        
Business Acquisition [Line Items]        
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net $ (2,700)   $ (2,741)