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Revenue Recognition (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Total revenues $ 431,972 $ 394,898 $ 840,010 $ 767,439
On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products        
Disaggregation of Revenue [Line Items]        
Total revenues 272,320 259,306 537,043 506,340
Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 67,552 61,994 127,230 121,582
Industrial grating and fencing products        
Disaggregation of Revenue [Line Items]        
Total revenues 32,446 29,134 62,543 57,293
Air-cooled heat exchangers        
Disaggregation of Revenue [Line Items]        
Total revenues 48,576 33,774 92,843 64,235
Heat transfer products        
Disaggregation of Revenue [Line Items]        
Total revenues 11,043 10,655 20,277 17,920
General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 35 35 74 69
Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 110,451 104,348 222,092 205,607
North America        
Disaggregation of Revenue [Line Items]        
Total revenues 214,618 186,707 404,985 357,475
Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 43,610 45,844 90,641 90,922
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 43,421 41,485 83,362 79,417
Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 12,150 9,953 23,703 20,509
Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 7,722 6,561 15,227 13,509
Harsco Metals & Minerals Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 272,320 259,306 537,043 506,340
Harsco Metals & Minerals Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products        
Disaggregation of Revenue [Line Items]        
Total revenues 272,320 259,306 537,043 506,340
Harsco Metals & Minerals Segment | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Metals & Minerals Segment | Industrial grating and fencing products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Metals & Minerals Segment | Air-cooled heat exchangers        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Metals & Minerals Segment | Heat transfer products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Metals & Minerals Segment | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Metals & Minerals Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 97,410 97,516 194,331 189,236
Harsco Metals & Minerals Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 79,862 70,759 150,927 137,992
Harsco Metals & Minerals Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 37,388 39,758 78,846 77,778
Harsco Metals & Minerals Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 37,788 34,759 74,009 67,316
Harsco Metals & Minerals Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 12,150 9,953 23,703 20,509
Harsco Metals & Minerals Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 7,722 6,561 15,227 13,509
Harsco Industrial Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 92,065 73,563 175,663 139,448
Harsco Industrial Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Industrial Segment | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Industrial Segment | Industrial grating and fencing products        
Disaggregation of Revenue [Line Items]        
Total revenues 32,446 29,134 62,543 57,293
Harsco Industrial Segment | Air-cooled heat exchangers        
Disaggregation of Revenue [Line Items]        
Total revenues 48,576 33,774 92,843 64,235
Harsco Industrial Segment | Heat transfer products        
Disaggregation of Revenue [Line Items]        
Total revenues 11,043 10,655 20,277 17,920
Harsco Industrial Segment | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Industrial Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Industrial Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 87,174 67,165 166,032 125,516
Harsco Industrial Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 4,891 5,308 9,631 11,890
Harsco Industrial Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 0 1,090 0 2,042
Harsco Industrial Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Industrial Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 67,552 61,994 127,230 121,582
Harsco Rail Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 67,552 61,994 127,230 121,582
Harsco Rail Segment | Industrial grating and fencing products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment | Air-cooled heat exchangers        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment | Heat transfer products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 13,041 6,832 27,761 16,371
Harsco Rail Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 47,547 48,748 87,952 93,898
Harsco Rail Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 1,331 778 2,164 1,254
Harsco Rail Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 5,633 5,636 9,353 10,059
Harsco Rail Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Harsco Rail Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 35 35 74 69
Corporate | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Industrial grating and fencing products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Air-cooled heat exchangers        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Heat transfer products        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 35 35 74 69
Corporate | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 35 35 74 69
Corporate | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues $ 0 $ 0 $ 0 $ 0