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Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Jan. 01, 2018
Dec. 31, 2017
Accounts receivable              
Trade accounts receivable $ 308,278   $ 308,278       $ 292,765
Less: Allowance for doubtful accounts (4,113)   (4,113)       (4,731)
Trade accounts receivable, net 304,165   304,165     $ 288,566 288,034
Other receivables 55,156   55,156       20,224
Provision for doubtful accounts related to trade accounts receivable (26) $ 4,087 (182) $ 5,262      
Inventories              
Finished goods 19,957   19,957       26,415
Work-in-process 22,175   22,175       24,367
Contracts-in-process 0   0       45,599
Raw materials and purchased parts 72,935   72,935       58,943
Stores and supplies 22,701   22,701       22,969
Inventories 137,768   137,768     $ 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 9,700   9,700       3,000
Net customer advances 54,004   54,004       117,958
Contract estimated forward loss provision for Harsco Rail Segment     1,800   $ 45,100    
SBB [Member]              
Inventory for Contracts              
Net customer advances             $ 97,900
Revenues $ 5,000 $ 0 $ 20,400        
Contract 1 [Member] | SBB [Member]              
Inventory for Contracts              
Percentage complete 98.00%   98.00%        
Contract 2 [Member] | SBB [Member]              
Inventory for Contracts              
Percentage complete 24.00%   24.00%