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Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Dec. 31, 2017
Accounts receivable          
Trade accounts receivable $ 297,515       $ 292,765
Less: Allowance for doubtful accounts (4,549)       (4,731)
Trade accounts receivable, net 292,966     $ 288,566 288,034
Other receivables 24,813       20,224
Provision for doubtful accounts related to trade accounts receivable (46) $ (22)      
Inventories          
Finished goods 18,747       26,415
Work-in-process 20,967       24,367
Contracts-in-process 0       45,599
Raw materials and purchased parts 68,531       58,943
Stores and supplies 24,107       22,969
Inventories 132,352     $ 118,500 178,293
Inventory for Contracts          
Contract costs accumulated to date         73,740
Estimated loss provisions for contracts-in-process         (28,141)
Contracts-in-process 0       45,599
Loss provision that exceeds accumulated contract costs 10,400       3,000
Customer Advances and Deposits 49,900       $ 97,900
Contract estimated forward loss provision for Harsco Rail Segment 1,800   $ 45,100    
SBB [Member]          
Revenue from External Customer [Line Items]          
Revenues $ 7,900 $ 0      
Contract 1 [Member] | SBB [Member]          
Revenue from External Customer [Line Items]          
Percentage Complete 98.00%        
Contract 2 [Member] | SBB [Member]          
Revenue from External Customer [Line Items]          
Percentage Complete 15.00%