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Acquisitions and Dispositions - Pro Forma Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]    
Interest expense $ 12,649 $ 5,507
Gain on disposition of business (18,462)  
Harsco Clean Earth Segment    
Business Acquisition [Line Items]    
Pro forma revenues   393,500
Pro forma net income (including discontinued operations)   15,600
Gain on disposition of business $ 417,500  
Acquisition-related Costs [Member] | Harsco Clean Earth Segment    
Business Acquisition [Line Items]    
Interest expense   $ 9,000