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SEGMENT REPORTING - Adjusted EBITDA and Significant Segment Expense Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Direct Revenues | $ 5,889,952 | $ 5,409,152 | $ 5,166,605
Cost of Revenues | 4,065,713 | 3,746,124 | 3,543,930
Selling, general and administrative expenses | 739,629 | 671,161 | 627,391
Total Reportable Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct Revenues | 5,889,545 | 5,408,705 | 5,166,098
Cost of Revenues | 4,025,239 | 3,709,344 | 3,518,282
Selling, general and administrative expenses | 449,838 | 424,880 | 388,436
Total Reportable Segment Adjusted EBITDA | 1,414,468 | 1,274,481 | 1,259,380
Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct Revenues | 5,004,747 | 4,511,442 | 4,171,706
Cost of Revenues | 3,366,022 | 3,063,043 | 2,902,979
Selling, general and administrative expenses | 371,263 | 346,791 | 315,674
Total Reportable Segment Adjusted EBITDA | 1,267,462 | 1,101,608 | 953,053
Safety-Kleen Sustainability Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct Revenues | 884,798 | 897,263 | 994,392
Cost of Revenues | 659,217 | 646,301 | 615,303
Selling, general and administrative expenses | 78,575 | 78,089 | 72,762
Total Reportable Segment Adjusted EBITDA | $ 147,006 | $ 172,873 | $ 306,327

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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