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Acquisitions and Dispositions - Acquisitions Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 06, 2020
Jun. 28, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]            
Additional interest expense     $ 16,004,000 $ 15,794,000 $ 48,854,000 $ 43,396,000
Gain (loss) on sale of discontinued business     $ 0 0 $ 0 18,371,000
Stericycle            
Business Acquisition [Line Items]            
Corporate charge           8,900,000
ESOL            
Business Acquisition [Line Items]            
Percentage of interests acquired 100.00%          
Cash consideration $ 429,000,000          
Goodwill to be deductible for income tax purposes $ 36,800,000          
Direct acquisition costs       $ 10,600,000   41,000,000
Harsco Clean Earth Segment            
Business Acquisition [Line Items]            
Percentage of interests acquired   100.00%        
Cash consideration   $ 628,000,000        
Business Acquisition, Purchased Enterprise Valuation   $ 625,000,000        
Clean Earth and ESOL            
Business Acquisition [Line Items]            
Additional interest expense           $ 4,700,000