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Debt and Credit Agreements (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Nov. 03, 2016
Jun. 30, 2016
Dec. 31, 2015
Dec. 02, 2015
Dec. 01, 2015
Debt Instrument [Line Items]                
Proceeds from sale of equity interest   $ 145,000,000            
Repayment of debt   275,768,000 $ 101,679,000          
Carrying value of long-term debt   $ 678,100,000       $ 880,800,000    
Scenario, Forecast                
Debt Instrument [Line Items]                
Cost of early extinguishment and write-off of unamortized deferred financing costs $ 37,000,000              
Harsco Infrastructure | Infrastructure Transaction Strategic Venture                
Debt Instrument [Line Items]                
Percentage of ownership   26.00%     26.00% 29.00%    
Term Loan | Term Loan Facility 2015                
Debt Instrument [Line Items]                
Principal amount             $ 250,000,000  
Repayment of debt   $ 85,000,000            
Carrying value of long-term debt   $ 158,800,000       $ 250,000,000    
Term Loan | New Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Principal amount       $ 550,000,000        
Senior Notes | 5.75% Senior Notes due 2018                
Debt Instrument [Line Items]                
Stated interest rate   5.75%            
Line of Credit                
Debt Instrument [Line Items]                
Borrowing capacity   $ 350,000,000         $ 600,000,000 $ 500,000,000
Deferred financing costs   1,100,000            
Revolving Credit Facility                
Debt Instrument [Line Items]                
Carrying value of long-term debt   40,000,000       $ 165,000,000    
Revolving Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Current borrowing capacity       $ 400,000,000        
Revolving Credit Facility | New Credit Facility                
Debt Instrument [Line Items]                
Repayment of debt   $ 60,000,000