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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 569,820 | $ 447,281 | $ 1,098,675 | $ 846,122
Waste Processing and Reuse Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 196,128 | 161,579 | 385,407 | 240,391
Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 233,523 | 174,238 | 458,583 | 381,834
Applied Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,830 | 26,591 | 64,615 | 56,853
Aluminum Dross and Scrap Processing Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,193 | 3,162 | 7,334 | 6,863
Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 60,123 | 40,411 | 106,563 | 83,026
After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,671 | 32,500 | 61,440 | 63,700
Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,352 | 8,800 | 14,733 | 13,455
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 344,861 | 275,396 | 659,582 | 477,862
Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 130,653 | 99,827 | 259,457 | 214,308
Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,367 | 25,623 | 65,580 | 59,548
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,830 | 27,774 | 64,336 | 55,638
Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,873 | 14,793 | 39,994 | 30,682
Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,236 | 3,868 | 9,726 | 8,084
Operating Segments | Harsco Environmental Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 272,546 | 203,991 | 530,532 | 445,550
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 | 233,523 | 174,238 | 458,583 | 381,834
Operating Segments | Harsco Environmental Segment | Applied Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,830 | 26,591 | 64,615 | 56,853
Operating Segments | Harsco Environmental Segment | Aluminum Dross and Scrap Processing Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,193 | 3,162 | 7,334 | 6,863
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 | 69,735 | 57,356 | 136,916 | 127,237
Operating Segments | Harsco Environmental Segment | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 116,981 | 82,972 | 229,152 | 179,289
Operating Segments | Harsco Environmental Segment | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,799 | 25,108 | 64,452 | 58,368
Operating Segments | Harsco Environmental Segment | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,922 | 19,894 | 50,292 | 41,890
Operating Segments | Harsco Environmental Segment | Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,873 | 14,793 | 39,994 | 30,682
Operating Segments | Harsco Environmental Segment | Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,236 | 3,868 | 9,726 | 8,084
Operating Segments | Harsco Clean Earth Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 196,128 | 161,579 | 385,407 | 240,391
Operating Segments | Harsco Clean Earth Segment | Waste Processing and Reuse Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 196,128 | 161,579 | 385,407 | 240,391
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 | 196,128 | 161,579 | 385,407 | 240,391
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 | 101,146 | 81,711 | 182,736 | 160,181
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 | 60,123 | 40,411 | 106,563 | 83,026
Operating Segments | Harsco Rail Segment | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,671 | 32,500 | 61,440 | 63,700
Operating Segments | Harsco Rail Segment | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,352 | 8,800 | 14,733 | 13,455
Operating Segments | Harsco Rail Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 78,998 | 56,461 | 137,259 | 110,234
Operating Segments | Harsco Rail Segment | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 13,672 | 16,855 | 30,305 | 35,019
Operating Segments | Harsco Rail Segment | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 568 | 515 | 1,128 | 1,180
Operating Segments | Harsco Rail Segment | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,908 | 7,880 | 14,044 | 13,748
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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