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Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total revenues $ 609,993 $ 609,016 $ 1,210,310 $ 1,169,721
Environmental services related to resource recovery for metals manufacturing and related logistical services        
Disaggregation of Revenue [Line Items]        
Total revenues 253,685 242,638 511,813 471,999
Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 34,263 40,504 70,527 78,906
Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 4,981 6,451 9,708 11,877
Railway Track Maintenance Equipment        
Disaggregation of Revenue [Line Items]        
Total revenues 30,517 44,796 60,436 74,240
After-market Parts and Services; Safety and Diagnostic Technology        
Disaggregation of Revenue [Line Items]        
Total revenues 35,131 34,530 66,007 62,323
Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 15,311 9,522 29,684 17,337
Hazardous waste processing solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 194,874 197,506 386,784 383,618
Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 41,231 33,069 75,351 69,421
North America        
Disaggregation of Revenue [Line Items]        
Total revenues 373,176 381,641 727,847 726,740
Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 128,272 118,695 259,919 233,268
Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 43,198 42,741 87,159 84,300
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 35,690 39,799 72,930 75,859
Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 25,182 21,117 53,531 39,522
Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,475 5,023 8,924 10,032
Operating Segments | Harsco Environmental Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 292,929 289,593 592,048 562,782
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 253,685 242,638 511,813 471,999
Operating Segments | Harsco Environmental Segment | Ecoproducts        
Disaggregation of Revenue [Line Items]        
Total revenues 34,263 40,504 70,527 78,906
Operating Segments | Harsco Environmental Segment | Environmental systems for aluminum dross and scrap processing        
Disaggregation of Revenue [Line Items]        
Total revenues 4,981 6,451 9,708 11,877
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 84,027 81,616 168,237 160,089
Operating Segments | Harsco Environmental Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 109,620 107,318 219,895 208,704
Operating Segments | Harsco Environmental Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 41,280 42,180 84,201 83,135
Operating Segments | Harsco Environmental Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 28,345 32,339 57,260 61,300
Operating Segments | Harsco Environmental Segment | Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 25,182 21,117 53,531 39,522
Operating Segments | Harsco Environmental Segment | Eastern Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 4,475 5,023 8,924 10,032
Operating Segments | Clean Earth Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 236,105 230,575 462,135 453,039
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 194,874 197,506 386,784 383,618
Operating Segments | Clean Earth Segment | Soil and dredged materials processing and reuse solutions        
Disaggregation of Revenue [Line Items]        
Total revenues 41,231 33,069 75,351 69,421
Operating Segments | Clean Earth Segment | North America        
Disaggregation of Revenue [Line Items]        
Total revenues 236,105 230,575 462,135 453,039
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 80,959 88,848 156,127 153,900
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 30,517 44,796 60,436 74,240
Operating Segments | Harsco Rail Segment | After-market Parts and Services; Safety and Diagnostic Technology        
Disaggregation of Revenue [Line Items]        
Total revenues 35,131 34,530 66,007 62,323
Operating Segments | Harsco Rail Segment | Railway Contracting Services        
Disaggregation of Revenue [Line Items]        
Total revenues 15,311 9,522 29,684 17,337
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 53,044 69,450 97,475 113,612
Operating Segments | Harsco Rail Segment | Western Europe        
Disaggregation of Revenue [Line Items]        
Total revenues 18,652 11,377 40,024 24,564
Operating Segments | Harsco Rail Segment | Latin America        
Disaggregation of Revenue [Line Items]        
Total revenues 1,918 561 2,958 1,165
Operating Segments | Harsco Rail Segment | Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Total revenues 7,345 7,460 15,670 14,559
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