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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Revenue from External Customer [Line Items]        
Contract estimated forward loss provision for Harsco Rail Segment     $ 1,800 $ 45,100
Loss provision that exceeds accumulated contract costs $ 6,400      
Revenues 398,841 $ 329,902    
SBB [Member]        
Revenue from External Customer [Line Items]        
Revenues $ 10,100 $ 4,700    
Contract 2 [Member] | SBB [Member]        
Revenue from External Customer [Line Items]        
Percentage complete 50.00%