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Acquisitions and Dispositions - Acquisitions Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 28, 2019
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]      
Total revenues   $ 398,841 $ 329,902
Additional interest expense   12,649 5,507
Purchase price   4,157 (680)
Harsco Clean Earth Segment      
Business Acquisition [Line Items]      
Percentage of interests acquired 100.00%    
Enterprise valuation $ 625,000    
Cash consideration 628,000    
Estimated reimbursements 8,000    
Goodwill to be deductible for income tax purposes $ 16,300    
Direct acquisition costs   $ 100 600
Harsco Clean Earth Segment | Acquisition-related Borrowings      
Business Acquisition [Line Items]      
Additional interest expense     $ 9,000