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SEGMENT REPORTING (Tables)
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Schedule of Reconciliation of Third Party Revenues to Direct Revenues
The following tables reconcile third-party revenues to direct revenues for the years ended December 31, 2023, 2022 and 2021 (in thousands):
 For the year ended December 31, 2023
 Environmental
Services		Safety-Kleen Sustainability SolutionsCorporate
Items		Total
Third-party revenues$4,469,909 $938,796 $447 $5,409,152 
Intersegment revenues (expense), net41,533 (41,533)— — 
Direct revenues$4,511,442 $897,263 $447 $5,409,152 
 For the year ended December 31, 2022
 Environmental
Services
Safety-Kleen Sustainability Solutions
Corporate
Items		Total
Third-party revenues$4,144,973 $1,021,125 $507 $5,166,605 
Intersegment revenues (expense), net26,733 (26,733)— — 
Direct revenues$4,171,706 $994,392 $507 $5,166,605 
 For the year ended December 31, 2021
 Environmental
Services
Safety-Kleen Sustainability Solutions
Corporate
Items		Total
Third-party revenues$3,025,907 $779,360 $299 $3,805,566 
Intersegment revenues (expense), net6,547 (6,547)— — 
Direct revenues$3,032,454 $772,813 $299 $3,805,566 
Schedule of Reconciliation to Consolidated Statements of Income to Adjusted EBITDA
The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):
 For the years ended December 31,
 202320222021
Adjusted EBITDA:   
Environmental Services$1,101,608 $953,053 $659,718 
Safety-Kleen Sustainability Solutions172,873 306,327 227,354 
Corporate Items(261,911)(237,252)(210,466)
Total1,012,570 1,022,128 676,606 
Reconciliation to Consolidated Statements of Operations:   
Accretion of environmental liabilities13,667 12,943 11,745 
Stock-based compensation20,703 26,844 18,839 
Depreciation and amortization365,761 347,594 298,135 
Income from operations612,439 634,747 347,887 
Other (income) expense, net(2,315)(2,472)515 
Loss on early extinguishment of debt2,880 422 — 
Gain on sale of business— (8,864)— 
Interest expense, net of interest income108,595 107,663 77,657 
Income from operations before provision for income taxes$503,279 $537,998 $269,715 
Schedule of Segment Reporting Information, by Segment
The following table presents assets by reported segment and in the aggregate (in thousands):
December 31, 2023December 31, 2022
Property, plant and equipment, net  
Environmental Services$1,651,026 $1,467,641 
Safety-Kleen Sustainability Solutions411,415 398,660 
Corporate Items130,877 114,001 
Total property, plant and equipment, net$2,193,318 $1,980,302 
Goodwill and Permits and other intangibles, net  
Environmental Services  
Goodwill$1,112,013 $1,071,846 
Permits and other intangibles, net454,919 462,050 
Total Environmental Services1,566,932 1,533,896 
Safety-Kleen Sustainability Solutions
Goodwill$175,723 $175,032 
Permits and other intangibles, net147,878 158,732 
Total Safety-Kleen Sustainability Solutions323,601 333,764 
Total$1,890,533 $1,867,660 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
As of December 31, 2023 and 2022, the Company had property, plant and equipment, net of depreciation and amortization and permits and other intangible assets, net of amortization in the following geographic locations (in thousands):
December 31, 2023December 31, 2022
Total% of TotalTotal% of Total
Property, plant and equipment, net  
United States$1,972,221 89.9 %$1,765,291 89.1 %
Canada and other foreign221,097 10.1 215,011 10.9 
Total property, plant and equipment, net$2,193,318 100.0 %$1,980,302 100.0 %
Permits and other intangibles, net  
United States$570,049 94.6 %$585,887 94.4 %
Canada32,748 5.4 34,895 5.6 
Total permits and other intangibles, net$602,797 100.0 %$620,782 100.0 %
Schedule of Long-lived Assets by Geographic Areas
The following table presents the total assets by geographical area (in thousands):
December 31, 2023December 31, 2022
United States$5,786,937 $5,595,255 
Canada and other foreign595,932 534,452 
Total$6,382,869 $6,129,707