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Acquisitions and Dispositions - Acquisitions Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 06, 2020
Jun. 28, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]            
Additional interest expense     $ 15,986,000 $ 14,953,000 $ 32,850,000 $ 27,602,000
Gain (loss) on sale of discontinued business     $ 0 (91,000) $ 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 $ 429,000,000.0          
Goodwill to be deductible for income tax purposes $ 36,800,000          
Direct acquisition costs       $ 17,200,000   30,300,000
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