v3.26.1
Review of Operations by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting [Abstract]    
Number of reportable segments disclosed by definition flag Total Reportable Segments  
Operations by segment    
Total revenues $ 549,803 $ 547,907
Selling, general and administrative expenses 91,456 89,108
Other segment activities 12,715 4,485
Operating income (loss) from continuing operations 793 29,261
Interest income 473 454
Interest expense (27,833) (26,574)
Facility fees and debt-related income (expense) (2,294) (2,612)
Defined benefit pension income (expense) (3,936) (5,201)
Income (loss) from continuing operations before income taxes and equity in income (32,797) (4,672)
Depreciation 40,428 36,442
Amortization 7,844 7,403
Capital expenditures 33,727 21,624
Service and Product    
Operations by segment    
Cost of services and products sold 444,839 425,053
Operating Segments    
Operations by segment    
Total revenues 549,803 547,907
Selling, general and administrative expenses 80,714 77,172
Other segment activities 1,640 6,183
Operating income (loss) from continuing operations 22,610 39,499
Depreciation 40,195 36,161
Amortization 6,795 6,452
Capital expenditures 33,598 21,526
Operating Segments | Service and Product    
Operations by segment    
Cost of services and products sold 444,839 425,053
Operating Segments | Harsco Environmental    
Operations by segment    
Total revenues 256,717 243,106
Selling, general and administrative expenses 27,943 26,628
Other segment activities 738 4,388
Operating income (loss) from continuing operations 10,029 10,073
Depreciation 27,896 25,509
Amortization 572 540
Capital expenditures 17,407 14,094
Operating Segments | Harsco Environmental | Service and Product    
Operations by segment    
Cost of services and products sold 218,007 202,017
Operating Segments | Clean Earth    
Operations by segment    
Total revenues 225,755 234,854
Selling, general and administrative expenses 41,013 38,962
Other segment activities 104 (15)
Operating income (loss) from continuing operations 15,778 22,288
Depreciation 11,103 9,620
Amortization 5,938 5,845
Capital expenditures 14,423 6,652
Operating Segments | Clean Earth | Service and Product    
Operations by segment    
Cost of services and products sold 168,860 173,619
Operating Segments | Harsco Rail    
Operations by segment    
Total revenues 67,331 69,947
Selling, general and administrative expenses 11,758 11,582
Other segment activities 798 1,810
Operating income (loss) from continuing operations (3,197) 7,138
Depreciation 1,196 1,032
Amortization 285 67
Capital expenditures 1,768 780
Operating Segments | Harsco Rail | Service and Product    
Operations by segment    
Cost of services and products sold 57,972 49,417
Corporate    
Operations by segment    
Total revenues 0 0
Selling, general and administrative expenses 10,742 11,936
Other segment activities 11,075 (1,698)
Operating income (loss) from continuing operations (21,817) (10,238)
Depreciation 233 281
Amortization 1,049 951
Capital expenditures 129 98
Corporate | Service and Product    
Operations by segment    
Cost of services and products sold $ 0 $ 0