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Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Accounts receivable          
Trade accounts receivable $ 284,397   $ 284,397   $ 248,354
Less: Allowance for doubtful accounts (5,165)   (5,165)   (11,800)
Trade accounts receivable, net 279,232   279,232   236,554
Other receivables 22,647   22,647   21,053
Provision for doubtful accounts related to trade accounts receivable 4,087 $ (93) 5,262 $ 84  
Inventories          
Finished goods 28,765   28,765   26,464
Work-in-process 32,364   32,364   22,815
Contracts-in-process 79,279   79,279   54,044
Raw materials and purchased parts 62,188   62,188   61,450
Stores and supplies 24,412   24,412   22,908
Inventories 227,008   227,008   187,681
Inventory for Contracts          
Contract costs accumulated to date 119,322   119,322   90,276
Estimated loss provisions for contracts-in-process (40,043)   (40,043)   (36,232)
Contracts-in-process 79,279   79,279   54,044
Loss provision that exceeds accumulated contract costs 3,400   3,400   6,700
Customer Advances and Deposits 111,600   111,600   101,100
Contract estimated forward loss provision for Harsco Rail Segment   40,050 $ 0 40,050 $ 45,100
SBB [Member]          
Revenue from External Customer [Line Items]          
Revenues $ 1,000 $ 0   $ 1,000