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Revenue Recognition - Summary of Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 1,503,742 | $ 1,347,672 | $ 1,307,470
Environmental services related to resource recovery for metals manufacturing; and related logistical services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 881,696 | 924,766 | 890,371
Applied Products [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 127,875 | 128,488 | 120,957
Aluminum Dross and Scrap Processing Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 25,276 | 15,050 | 0
Railway Track Maintenance Equipment [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 145,968 | 112,547 | 146,267
After-market Parts and Services; Safety and Diagnostic Technology [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 132,249 | 139,020 | 110,195
Railway Contracting Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 21,156 | 27,727 | 39,537
Waste Processing and Reuse Solutions [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 169,522 | 0 | 0
General Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 74 | 143
North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 685,613 | 507,524 | 471,186
Western Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 431,162 | 438,856 | 448,461
Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 148,628 | 155,863 | 161,957
Asia-Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 159,441 | 167,850 | 156,218
Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 60,402 | 50,003 | 42,700
Eastern Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 18,496 | 27,576 | 26,948
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 74 | 143
Corporate | Environmental services related to resource recovery for metals manufacturing; and related logistical services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Applied Products [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Aluminum Dross and Scrap Processing Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Railway Track Maintenance Equipment [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | After-market Parts and Services; Safety and Diagnostic Technology [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Railway Contracting Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Waste Processing and Reuse Solutions [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | General Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 74 | 143
Corporate | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 74 | 143
Corporate | Western Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Asia-Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Eastern Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Environmental | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,034,847 | 1,068,304 | 1,011,328
Harsco Environmental | Operating segments | Environmental services related to resource recovery for metals manufacturing; and related logistical services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 881,696 | 924,766 | 890,371
Harsco Environmental | Operating segments | Applied Products [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 127,875 | 128,488 | 120,957
Harsco Environmental | Operating segments | Aluminum Dross and Scrap Processing Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 25,276 | 15,050 | 0
Harsco Environmental | Operating segments | Railway Track Maintenance Equipment [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Environmental | Operating segments | After-market Parts and Services; Safety and Diagnostic Technology [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Environmental | Operating segments | Railway Contracting Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Environmental | Operating segments | Waste Processing and Reuse Solutions [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Environmental | Operating segments | General Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Environmental | Operating segments | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 294,367 | 302,238 | 274,476
Harsco Environmental | Operating segments | Western Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 386,593 | 390,840 | 369,763
Harsco Environmental | Operating segments | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 146,040 | 151,886 | 159,130
Harsco Environmental | Operating segments | Asia-Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 128,949 | 145,761 | 138,311
Harsco Environmental | Operating segments | Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 60,402 | 50,003 | 42,700
Harsco Environmental | Operating segments | Eastern Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 18,496 | 27,576 | 26,948
Clean Earth | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 169,522 | 0 | 0
Clean Earth | Operating segments | Environmental services related to resource recovery for metals manufacturing; and related logistical services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Clean Earth | Operating segments | Applied Products [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Clean Earth | Operating segments | Aluminum Dross and Scrap Processing Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Clean Earth | Operating segments | Railway Track Maintenance Equipment [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Clean Earth | Operating segments | After-market Parts and Services; Safety and Diagnostic Technology [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Clean Earth | Operating segments | Railway Contracting Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Clean Earth | Operating segments | Waste Processing and Reuse Solutions [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 169,522 | 0 | 0
Clean Earth | Operating segments | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 169,522 |  |
Clean Earth | Operating segments | Western Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Clean Earth | Operating segments | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Clean Earth | Operating segments | Asia-Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Clean Earth | Operating segments | Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Clean Earth | Operating segments | Eastern Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Harsco Environmental | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Environmental | Operating segments | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Environmental | Operating segments | Western Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Environmental | Operating segments | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Environmental | Operating segments | Asia-Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Environmental | Operating segments | Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Environmental | Operating segments | Eastern Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 0 | 0
Harsco Rail | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 299,373 | 279,294 | 295,999
Harsco Rail | Operating segments | Environmental services related to resource recovery for metals manufacturing; and related logistical services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Rail | Operating segments | Applied Products [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Rail | Operating segments | Aluminum Dross and Scrap Processing Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Rail | Operating segments | Railway Track Maintenance Equipment [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 145,968 | 112,547 | 146,267
Harsco Rail | Operating segments | After-market Parts and Services; Safety and Diagnostic Technology [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 132,249 | 139,020 | 110,195
Harsco Rail | Operating segments | Railway Contracting Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 21,156 | 27,727 | 39,537
Harsco Rail | Operating segments | Waste Processing and Reuse Solutions [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Rail | Operating segments | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 221,724 | 205,212 | 196,567
Harsco Rail | Operating segments | Western Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 44,569 | 48,016 | 78,698
Harsco Rail | Operating segments | Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,588 | 3,977 | 2,827
Harsco Rail | Operating segments | Asia-Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 30,492 | 22,089 | 17,907
Harsco Rail | Operating segments | Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Harsco Rail | Operating segments | Eastern Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 0 | $ 0 | $ 0

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