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Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Jan. 01, 2018
Dec. 31, 2017
Accounts receivable              
Trade accounts receivable $ 299,723   $ 299,723       $ 292,765
Less: Allowance for doubtful accounts (4,333)   (4,333)       (4,731)
Trade accounts receivable, net 295,390   295,390     $ 288,566 288,034
Other receivables 27,349   27,349       20,224
Provision for doubtful accounts related to trade accounts receivable (110) $ 1,197 (156) $ 1,175      
Inventories              
Finished goods 21,463   21,463       26,415
Work-in-process 18,777   18,777       24,367
Contracts-in-process 0   0       45,599
Raw materials and purchased parts 67,389   67,389       58,943
Stores and supplies 23,242   23,242       22,969
Inventories 130,871   130,871     $ 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   0       45,599
Loss provision that exceeds accumulated contract costs 10,200   10,200       3,000
Customer Advances and Deposits 39,900   39,900       $ 97,900
Contract estimated forward loss provision for Harsco Rail Segment     1,800   $ 45,100    
SBB [Member]              
Revenue from External Customer [Line Items]              
Revenues $ 7,500 $ 0 $ 15,500        
Contract 1 [Member] | SBB [Member]              
Revenue from External Customer [Line Items]              
Percentage Complete 98.00%   98.00%        
Contract 2 [Member] | SBB [Member]              
Revenue from External Customer [Line Items]              
Percentage Complete 21.00%   21.00%