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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenues $ 562,254 $ 609,993 $ 1,110,538 $ 1,210,310
Environmental services related to resource recovery for metals manufacturing and related logistical services        
Disaggregation of Revenue [Line Items]        
Total revenues 240,450 253,685 467,655 511,813
Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 12,825 34,263 23,517 70,527
Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 4,734 4,981 9,943 9,708
Railway Track Maintenance Equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 15,652 30,517 48,720 60,436
After-market Parts and Services; Safety and Diagnostic Technology        
Disaggregation of Revenue [Line Items]        
Total revenues 24,356 35,131 47,271 66,007
Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 17,955 15,311 31,919 29,684
Hazardous waste processing solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 211,206 194,874 409,177 386,784
Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 35,076 41,231 72,336 75,351
North America        
Disaggregation of Revenue [Line Items]        
Total revenues 334,513 373,176 661,946 727,847
Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 128,126 128,272 252,994 259,919
Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 36,179 43,198 70,103 87,159
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 33,718 35,690 66,229 72,930
Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 24,757 25,182 50,106 53,531
Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,961 4,475 9,160 8,924
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues 562,254 609,993 1,110,538 1,210,310
Operating Segments | Harsco Environmental Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 258,009 292,929 501,115 592,048
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 240,450 253,685 467,655 511,813
Operating Segments | Harsco Environmental Segment | Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 12,825 34,263 23,517 70,527
Operating Segments | Harsco Environmental Segment | Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 4,734 4,981 9,943 9,708
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 57,613 84,027 112,839 168,237
Operating Segments | Harsco Environmental Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 105,304 109,620 202,948 219,895
Operating Segments | Harsco Environmental Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 35,546 41,280 67,670 84,201
Operating Segments | Harsco Environmental Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 29,828 28,345 58,392 57,260
Operating Segments | Harsco Environmental Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 24,757 25,182 50,106 53,531
Operating Segments | Harsco Environmental Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,961 4,475 9,160 8,924
Operating Segments | Clean Earth Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 246,282 236,105 481,513 462,135
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 211,206 194,874 409,177 386,784
Operating Segments | Clean Earth Segment | Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 35,076 41,231 72,336 75,351
Operating Segments | Clean Earth Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 246,282 236,105 481,513 462,135
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 57,963 80,959 127,910 156,127
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 15,652 30,517 48,720 60,436
Operating Segments | Harsco Rail Segment | After-market Parts and Services; Safety and Diagnostic Technology        
Disaggregation of Revenue [Line Items]        
Total revenues 24,356 35,131 47,271 66,007
Operating Segments | Harsco Rail Segment | Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 17,955 15,311 31,919 29,684
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 30,618 53,044 67,594 97,475
Operating Segments | Harsco Rail Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 22,822 18,652 50,046 40,024
Operating Segments | Harsco Rail Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 633 1,918 2,433 2,958
Operating Segments | Harsco Rail Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 3,890 7,345 7,837 15,670
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