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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 574,815 | $ 573,627 | $ 1,685,353 | $ 1,783,937
Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 241,417 | 235,490 | 709,072 | 747,303
Ecoproducts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,980 | 36,663 | 38,497 | 107,190
Environmental systems for aluminum dross and scrap processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,734 | 6,995 | 14,677 | 16,703
Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,538 | 19,099 | 67,258 | 79,535
After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 31,227 | 23,495 | 78,498 | 89,502
Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 13,868 | 15,094 | 45,787 | 44,778
Hazardous waste processing solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 212,952 | 194,557 | 622,129 | 581,341
Soil and dredged materials processing and reuse solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 37,099 | 42,234 | 109,435 | 117,585
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 341,666 | 338,751 | 1,003,612 | 1,066,598
Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 123,324 | 130,003 | 376,318 | 389,922
Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 39,127 | 38,442 | 109,230 | 125,601
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 39,211 | 35,836 | 105,440 | 108,766
Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,562 | 26,327 | 76,668 | 79,858
Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,925 | 4,268 | 14,085 | 13,192
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 574,815 | 573,627 | 1,685,353 | 1,783,937
Operating Segments | Harsco Environmental |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 261,131 | 279,148 | 762,246 | 871,196
Operating Segments | Harsco Environmental | Environmental services related to resource recovery for metals manufacturing and related logistical services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 241,417 | 235,490 | 709,072 | 747,303
Operating Segments | Harsco Environmental | Ecoproducts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,980 | 36,663 | 38,497 | 107,190
Operating Segments | Harsco Environmental | Environmental systems for aluminum dross and scrap processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,734 | 6,995 | 14,677 | 16,703
Operating Segments | Harsco Environmental | Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental | Hazardous waste processing solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental | Soil and dredged materials processing and reuse solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Environmental | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 57,750 | 70,316 | 170,589 | 238,553
Operating Segments | Harsco Environmental | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 101,108 | 108,709 | 304,056 | 328,604
Operating Segments | Harsco Environmental | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 38,815 | 38,195 | 106,485 | 122,396
Operating Segments | Harsco Environmental | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 31,971 | 31,333 | 90,363 | 88,593
Operating Segments | Harsco Environmental | Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,562 | 26,327 | 76,668 | 79,858
Operating Segments | Harsco Environmental | Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,925 | 4,268 | 14,085 | 13,192
Operating Segments | Clean Earth |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 250,051 | 236,791 | 731,564 | 698,926
Operating Segments | Clean Earth | 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 | Clean Earth | Ecoproducts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Environmental systems for aluminum dross and scrap processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Hazardous waste processing solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 212,952 | 194,557 | 622,129 | 581,341
Operating Segments | Clean Earth | Soil and dredged materials processing and reuse solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 37,099 | 42,234 | 109,435 | 117,585
Operating Segments | Clean Earth | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 250,051 | 236,791 | 731,564 | 698,926
Operating Segments | Clean Earth | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Earth | Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 63,633 | 57,688 | 191,543 | 213,815
Operating Segments | Harsco Rail | 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 | Ecoproducts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail | Environmental systems for aluminum dross and scrap processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail | Railway Track Maintenance Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,538 | 19,099 | 67,258 | 79,535
Operating Segments | Harsco Rail | After-market Parts and Services; Safety and Diagnostic Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 31,227 | 23,495 | 78,498 | 89,502
Operating Segments | Harsco Rail | Railway Contracting Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 13,868 | 15,094 | 45,787 | 44,778
Operating Segments | Harsco Rail | Hazardous waste processing solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail | Soil and dredged materials processing and reuse solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 0 | 0
Operating Segments | Harsco Rail | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,865 | 31,644 | 101,459 | 129,119
Operating Segments | Harsco Rail | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,216 | 21,294 | 72,262 | 61,318
Operating Segments | Harsco Rail | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 312 | 247 | 2,745 | 3,205
Operating Segments | Harsco Rail | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,240 | 4,503 | 15,077 | 20,173
Operating Segments | Harsco Rail | Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Harsco Rail | Eastern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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