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SEGMENT REPORTING (Tables) | 6 Months Ended
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Jun. 30, 2024
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 three and six months ended June 30, 2024 and 2023 (in thousands):
| Three Months Ended |  | Three Months Ended
| June 30, 2024 |  | June 30, 2023
| Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  |  |  | Direct Revenues |  | Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  | Direct Revenues
Environmental Services | $ | 1,297,298 |  |  | $ | 12,085 |  |  |  |  | $ | 1,309,383 |  |  | $ | 1,161,482 |  |  | $ | 10,554 |  |  | $ | 1,172,036 |
Safety-Kleen Sustainability Solutions | 255,322 |  |  | (12,085) |  |  |  |  | 243,237 |  |  | 236,302 |  |  | (10,554) |  |  | 225,748 |
Corporate Items | 99 |  |  | — |  |  |  |  | 99 |  |  | 116 |  |  | — |  |  | 116 |
Total | $ | 1,552,719 |  |  | $ | — |  |  |  |  | $ | 1,552,719 |  |  | $ | 1,397,900 |  |  | $ | — |  |  | $ | 1,397,900 |
| Six Months Ended |  | Six Months Ended
| June 30, 2024 |  | June 30, 2023
| Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  |  |  | Direct Revenues |  | Third-Party Revenues |  | Intersegment Revenues (Expenses), net |  | Direct Revenues
Environmental Services | $ | 2,458,577 |  |  | $ | 23,316 |  |  |  |  | $ | 2,481,893 |  |  | $ | 2,222,464 |  |  | $ | 20,313 |  |  | $ | 2,242,777 |
Safety-Kleen Sustainability Solutions | 470,636 |  |  | (23,316) |  |  |  |  | 447,320 |  |  | 482,600 |  |  | (20,313) |  |  | 462,287 |
Corporate Items | 201 |  |  | — |  |  |  |  | 201 |  |  | 223 |  |  | — |  |  | 223 |
Total | $ | 2,929,414 |  |  | $ | — |  |  |  |  | $ | 2,929,414 |  |  | $ | 2,705,287 |  |  | $ | — |  |  | $ | 2,705,287 |
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):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Adjusted EBITDA: |  |  |  |  |  |  |
Environmental Services | $ | 359,915 |  |  | $ | 305,622 |  |  | $ | 624,390 |  |  | $ | 533,967 |
Safety-Kleen Sustainability Solutions | 51,476 |  |  | 53,415 |  |  | 81,176 |  |  | 94,878 |
Corporate Items | (83,575) |  |  | (71,531) |  |  | (147,655) |  |  | (126,201) |
Total | 327,816 |  |  | 287,506 |  |  | 557,911 |  |  | 502,644 |
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |
Accretion of environmental liabilities | 3,304 |  |  | 3,486 |  |  | 6,521 |  |  | 6,893 |
Stock-based compensation | 8,515 |  |  | 4,500 |  |  | 14,853 |  |  | 10,518 |
Depreciation and amortization | 100,504 |  |  | 89,697 |  |  | 195,569 |  |  | 174,455 |
Income from operations | 215,493 |  |  | 189,823 |  |  | 340,968 |  |  | 310,778 |
Other expense, net | 167 |  |  | 1,283 |  |  | 1,308 |  |  | 1,167 |
Loss on early extinguishment of debt | — |  |  | — |  |  | — |  |  | 2,362 |
Interest expense, net of interest income | 36,449 |  |  | 30,072 |  |  | 64,988 |  |  | 50,704 |
Income before provision for income taxes | $ | 178,877 |  |  | $ | 158,468 |  |  | $ | 274,672 |  |  | $ | 256,545 |

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