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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Total revenues $ 573,627 $ 596,968 $ 1,783,937 $ 1,766,689
Environmental services related to resource recovery for metals manufacturing and related logistical services        
Disaggregation of Revenue [Line Items]        
Total revenues 235,490 234,274 747,303 706,273
Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 36,663 43,841 107,190 122,747
Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 6,995 7,762 16,703 19,639
Railway Track Maintenance Equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 19,099 24,531 79,535 98,771
After-market Parts and Services; Safety and Diagnostic Technology        
Disaggregation of Revenue [Line Items]        
Total revenues 23,495 31,310 89,502 93,633
Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 15,094 16,539 44,778 33,876
Hazardous waste processing solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 194,557 194,927 581,341 578,545
Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 42,234 43,784 117,585 113,205
North America        
Disaggregation of Revenue [Line Items]        
Total revenues 338,751 367,561 1,066,598 1,094,301
Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 130,003 129,767 389,922 363,035
Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 38,442 45,051 125,601 129,351
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 35,836 26,851 108,766 102,710
Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 26,327 22,673 79,858 62,195
Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,268 5,065 13,192 15,097
Operating Segments | Harsco Environmental Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 279,148 285,877 871,196 848,659
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 235,490 234,274 747,303 706,273
Operating Segments | Harsco Environmental Segment | Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 36,663 43,841 107,190 122,747
Operating Segments | Harsco Environmental Segment | Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 6,995 7,762 16,703 19,639
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 | Hazardous waste processing solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Environmental Segment | Soil and dredged materials processing and reuse solutions        
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 70,316 78,528 238,553 238,617
Operating Segments | Harsco Environmental Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 108,709 109,473 328,604 318,177
Operating Segments | Harsco Environmental Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 38,195 44,351 122,396 127,486
Operating Segments | Harsco Environmental Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 31,333 25,787 88,593 87,087
Operating Segments | Harsco Environmental Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 26,327 22,673 79,858 62,195
Operating Segments | Harsco Environmental Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,268 5,065 13,192 15,097
Operating Segments | Clean Earth Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 236,791 238,711 698,926 691,750
Operating Segments | 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 | Clean Earth Segment | Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Clean Earth Segment | Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Clean Earth Segment | Railway Track Maintenance Equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | 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 | Clean Earth Segment | Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Clean Earth Segment | Hazardous waste processing solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 194,557 194,927 581,341 578,545
Operating Segments | Clean Earth Segment | Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 42,234 43,784 117,585 113,205
Operating Segments | Clean Earth Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 236,791 238,711 698,926 691,750
Operating Segments | Clean Earth Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Clean Earth Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Clean Earth Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Clean Earth Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | 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 57,688 72,380 213,815 226,280
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 | Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Rail Segment | Environmental systems for aluminum dross and scrap processing        
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 19,099 24,531 79,535 98,771
Operating Segments | Harsco Rail Segment | After-market Parts and Services; Safety and Diagnostic Technology        
Disaggregation of Revenue [Line Items]        
Total revenues 23,495 31,310 89,502 93,633
Operating Segments | Harsco Rail Segment | Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 15,094 16,539 44,778 33,876
Operating Segments | Harsco Rail Segment | Hazardous waste processing solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Harsco Rail Segment | Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues     0 0
Operating Segments | Harsco Rail Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 31,644 50,322 129,119 163,934
Operating Segments | Harsco Rail Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 21,294 20,294 61,318 44,858
Operating Segments | Harsco Rail Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 247 700 3,205 1,865
Operating Segments | Harsco Rail Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 4,503 1,064 20,173 15,623
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