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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 350,898 $ 339,907 $ 680,800 $ 664,347
On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems        
Disaggregation of Revenue [Line Items]        
Total revenues 269,338 272,320 530,650 537,043
Environmental solutions for contaminated materials, hazardous waste and dredged materials        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 81,560 67,552 150,150 127,230
General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues   35   74
North America        
Disaggregation of Revenue [Line Items]        
Total revenues 143,390 127,444 267,104 238,953
Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 109,016 110,451 217,250 222,092
Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 37,045 38,719 74,627 81,010
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 40,750 43,421 82,509 83,362
Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 15,742 12,150 29,657 23,703
Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,955 7,722 9,653 15,227
Harsco Environmental Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 78,112      
Harsco Clean Earth Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 0      
Harsco Rail Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 65,278      
Operating Segments | Harsco Environmental Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 269,338 272,320 530,650 537,043
Operating Segments | Harsco Environmental Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems        
Disaggregation of Revenue [Line Items]        
Total revenues 269,338 272,320 530,650 537,043
Operating Segments | Harsco Environmental Segment | Environmental solutions for contaminated materials, hazardous waste and dredged materials        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Environmental Segment | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Environmental Segment | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues   0   0
Operating Segments | Harsco Environmental Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues   79,862 151,461 150,927
Operating Segments | Harsco Environmental Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 98,478 97,410 196,699 194,331
Operating Segments | Harsco Environmental Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 36,272 37,388 73,263 78,846
Operating Segments | Harsco Environmental Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 35,779 37,788 69,917 74,009
Operating Segments | Harsco Environmental Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 15,742 12,150 29,657 23,703
Operating Segments | Harsco Environmental Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,955 7,722 9,653 15,227
Operating Segments | Harsco Clean Earth Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | Environmental solutions for contaminated materials, hazardous waste and dredged materials        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues   0   0
Operating Segments | Harsco Clean Earth Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues   0 0 0
Operating Segments | Harsco Clean Earth Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Clean Earth Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Rail Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 81,560 67,552 150,150 127,230
Operating Segments | Harsco Rail Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Rail Segment | Environmental solutions for contaminated materials, hazardous waste and dredged materials        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Rail Segment | Railway track maintenance services and equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 81,560 67,552 150,150 127,230
Operating Segments | Harsco Rail Segment | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues   0   0
Operating Segments | Harsco Rail Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues   47,547 115,643 87,952
Operating Segments | Harsco Rail Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 10,538 13,041 20,551 27,761
Operating Segments | Harsco Rail Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 773 1,331 1,364 2,164
Operating Segments | Harsco Rail Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 4,971 5,633 12,592 9,353
Operating Segments | Harsco Rail Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Rail Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues 0 35 0 74
Corporate | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate | Environmental solutions for contaminated materials, hazardous waste and dredged materials        
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 | General Corporate        
Disaggregation of Revenue [Line Items]        
Total revenues   35   74
Corporate | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 0 35 0 74
Corporate | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
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