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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 544,301 | $ 509,398 | $ 1,642,976 | $ 1,355,520
Waste Processing and Reuse Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 200,484 | 194,098 | 585,891 | 434,489
Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 230,340 | 181,867 | 688,923 | 563,701
Applied Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 36,091 | 38,166 | 100,706 | 95,019
Aluminum Dross and Scrap Processing Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,470 | 2,474 | 10,804 | 9,337
Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,553 | 55,493 | 140,116 | 138,519
After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,030 | 29,100 | 94,470 | 92,800
Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,333 | 8,200 | 22,066 | 21,655
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 320,516 | 315,876 | 980,098 | 793,738
Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 123,774 | 113,922 | 383,231 | 328,230
Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,765 | 29,497 | 101,345 | 89,045
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 37,983 | 30,239 | 102,319 | 85,877
Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,804 | 15,558 | 60,798 | 46,240
Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,459 | 4,306 | 15,185 | 12,390
Operating Segments | Harsco Environmental Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 269,901 | 222,507 | 800,433 | 668,057
Operating Segments | Harsco Environmental Segment | Waste Processing and Reuse Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental Segment | Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 230,340 | 181,867 | 688,923 | 563,701
Operating Segments | Harsco Environmental Segment | Applied Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 36,091 | 38,166 | 100,706 | 95,019
Operating Segments | Harsco Environmental Segment | Aluminum Dross and Scrap Processing Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,470 | 2,474 | 10,804 | 9,337
Operating Segments | Harsco Environmental Segment | Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental Segment | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental Segment | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 71,479 | 58,973 | 208,395 | 186,210
Operating Segments | Harsco Environmental Segment | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 106,859 | 92,506 | 336,011 | 271,795
Operating Segments | Harsco Environmental Segment | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,072 | 29,085 | 99,524 | 87,453
Operating Segments | Harsco Environmental Segment | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 30,228 | 22,079 | 80,520 | 63,969
Operating Segments | Harsco Environmental Segment | Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,804 | 15,558 | 60,798 | 46,240
Operating Segments | Harsco Environmental Segment | Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,459 | 4,306 | 15,185 | 12,390
Operating Segments | Harsco Clean Earth Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 200,484 | 194,098 | 585,891 | 434,489
Operating Segments | Harsco Clean Earth Segment | Waste Processing and Reuse Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 200,484 | 194,098 | 585,891 | 434,489
Operating Segments | Harsco Clean Earth Segment | Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Clean Earth Segment | Applied Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Clean Earth Segment | Aluminum Dross and Scrap Processing Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Clean Earth Segment | Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Clean Earth Segment | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Clean Earth Segment | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Clean Earth Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 200,484 | 194,098 | 585,891 | 434,489
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 | 73,916 | 92,793 | 256,652 | 252,974
Operating Segments | Harsco Rail Segment | Waste Processing and Reuse Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail Segment | Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail Segment | Applied Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail Segment | Aluminum Dross and Scrap Processing Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail Segment | Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,553 | 55,493 | 140,116 | 138,519
Operating Segments | Harsco Rail Segment | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,030 | 29,100 | 94,470 | 92,800
Operating Segments | Harsco Rail Segment | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,333 | 8,200 | 22,066 | 21,655
Operating Segments | Harsco Rail Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,553 | 62,805 | 185,812 | 173,039
Operating Segments | Harsco Rail Segment | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 16,915 | 21,416 | 47,220 | 56,435
Operating Segments | Harsco Rail Segment | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 693 | 412 | 1,821 | 1,592
Operating Segments | Harsco Rail Segment | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,755 | 8,160 | 21,799 | 21,908
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

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