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SEGMENT REPORTING (Tables)
 12 Months Ended
Dec. 31, 2024
Segment Reporting [Abstract]  
Schedule of Reconciliation of Third Party Revenues to Direct Revenues
The following tables reconcile third-party revenues to direct revenues by Reportable Segment (in thousands):
 For the year ended December 31, 2024
 Environmental
Services		Safety-Kleen Sustainability Solutions
Total
Segment Revenues
Corporate
Total Consolidated Revenues
Third-party revenues$4,960,325 $929,220 $5,889,545 $407 $5,889,952 
Intersegment revenues (expense), net44,422 (44,422)— — — 
Direct revenues$5,004,747 $884,798 $5,889,545 $407 $5,889,952 
 For the year ended December 31, 2023
 Environmental
Services
Safety-Kleen Sustainability Solutions
Total
Segment Revenues
Corporate
Total Consolidated Revenues
Third-party revenues$4,469,909 $938,796 $5,408,705 $447 $5,409,152 
Intersegment revenues (expense), net41,533 (41,533)— — — 
Direct revenues$4,511,442 $897,263 $5,408,705 $447 $5,409,152 
 For the year ended December 31, 2022
 Environmental
Services
Safety-Kleen Sustainability Solutions
Total
Segment Revenues
Corporate
Total Consolidated Revenues
Third-party revenues$4,144,973 $1,021,125 $5,166,098 $507 $5,166,605 
Intersegment revenues (expense), net26,733 (26,733)— — — 
Direct revenues$4,171,706 $994,392 $5,166,098 $507 $5,166,605 
Schedule of Reconciliation to Consolidated Statements of Income to Adjusted EBITDA
The tables below present total Reportable Segment Adjusted EBITDA and the relevant significant segment expenses provided to the CODM by reported segment (in thousands):
For the year ended December 31, 2024
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$5,004,747 $884,798 $5,889,545 
Cost of Revenues3,366,022 659,217 4,025,239 
Selling, General and Administrative Expenses371,263 78,575 449,838 
Total Reportable Segment Adjusted EBITDA$1,267,462 $147,006 $1,414,468 
For the year ended December 31, 2023
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$4,511,442 $897,263 $5,408,705 
Cost of Revenues3,063,043 646,301 3,709,344 
Selling, General and Administrative Expenses346,791 78,089 424,880 
Total Reportable Segment Adjusted EBITDA$1,101,608 $172,873 $1,274,481 
For the year ended December 31, 2022
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$4,171,706 $994,392 $5,166,098 
Cost of Revenues2,902,979 615,303 3,518,282 
Selling, General and Administrative Expenses315,674 72,762 388,436 
Total Reportable Segment Adjusted EBITDA$953,053 $306,327 $1,259,380 
The following table presents Total Reportable Segment Adjusted EBITDA reconciled to income from operations before provision for income taxes (in thousands):
 For the years ended December 31,
 202420232022
Adjusted EBITDA:
Environmental Services$1,267,462 $1,101,608 $953,053 
Safety-Kleen Sustainability Solutions147,006 172,873 306,327 
Total Reportable Segment Adjusted EBITDA
1,414,468 1,274,481 1,259,380 
Reconciliation to Consolidated Statements of Operations:
Corporate Costs (1)
297,534 261,911 237,252 
Accretion of environmental liabilities13,456 13,667 12,943 
Stock-based compensation27,981 20,703 26,844 
Depreciation and amortization400,922 365,761 347,594 
Kimball startup costs4,343 — — 
Income from operations670,232 612,439 634,747 
Other expense (income), net1,454 (2,315)(2,472)
Loss on early extinguishment of debt371 2,880 422 
Gain on sale of business— — (8,864)
Interest expense, net of interest income134,964 108,595 107,663 
Income from operations before provision for income taxes$533,443 $503,279 $537,998 
___________________________________
(1) Corporate Costs include the revenue, cost of revenues and selling, general and administrative expenses not managed through the Company’s operating segments. These costs are not captured within the Company’s Reportable Segment Adjusted EBITDA but are included in the Company’s total Adjusted EBITDA balances.
Schedule of Segment Reporting Information, by Segment
The following table presents assets by reported segment and in the aggregate (in thousands):
December 31, 2024December 31, 2023
Property, plant and equipment, net  
Environmental Services$1,865,611 $1,651,026 
Safety-Kleen Sustainability Solutions463,538 411,415 
Corporate
118,792 130,877 
Total property, plant and equipment, net$2,447,941 $2,193,318 
Goodwill and Permits and other intangibles, net  
Environmental Services  
Goodwill$1,296,204 $1,112,013 
Permits and other intangibles, net549,482 454,919 
Total Environmental Services1,845,686 1,566,932 
Safety-Kleen Sustainability Solutions
Goodwill$180,995 $175,723 
Permits and other intangibles, net152,505 147,878 
Total Safety-Kleen Sustainability Solutions333,500 323,601 
Total$2,179,186 $1,890,533 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
As of December 31, 2024 and 2023, 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, 2024December 31, 2023
Total% of TotalTotal% of Total
Property, plant and equipment, net  
United States$2,249,155 91.9 %$1,972,221 89.9 %
Canada and other foreign198,786 8.1 221,097 10.1 
Total property, plant and equipment, net$2,447,941 100.0 %$2,193,318 100.0 %
Permits and other intangibles, net  
United States$674,246 96.0 %$570,049 94.6 %
Canada27,741 4.0 32,748 5.4 
Total permits and other intangibles, net$701,987 100.0 %$602,797 100.0 %
Schedule of Long-lived Assets by Geographic Areas
The following table presents the total assets by geographical area (in thousands):
December 31, 2024December 31, 2023
United States$6,756,813 $5,786,937 
Canada and other foreign620,465 595,932 
Total$7,377,278 $6,382,869