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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes to Goodwill | The changes in goodwill by segment for the nine months ended September 30, 2025 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Totals
Balance at January 1, 2025 | $ | 1,296,204 |  |  | $ | 180,995 |  |  | $ | 1,477,199 |
Measurement period adjustments from prior period acquisitions | 146 |  |  | (99) |  |  | 47 |
Foreign currency translation | 1,130 |  |  | 455 |  |  | 1,585 |
Balance at September 30, 2025 | $ | 1,297,480 |  |  | $ | 181,351 |  |  | $ | 1,478,831 |
Schedule of Finite-Lived Intangible Assets | As of September 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands):
| September 30, 2025 |  | December 31, 2024
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 194,193 |  |  | $ | 130,053 |  |  | $ | 64,140 |  |  | $ | 191,921 |  |  | $ | 123,939 |  |  | $ | 67,982 |
Customer and supplier relationships | 698,036 |  |  | 283,708 |  |  | 414,328 |  |  | 697,326 |  |  | 256,657 |  |  | 440,669 |
Other intangible assets | 120,404 |  |  | 54,714 |  |  | 65,690 |  |  | 120,316 |  |  | 46,490 |  |  | 73,826 |
Total amortizable permits and other intangible assets | 1,012,633 |  |  | 468,475 |  |  | 544,158 |  |  | 1,009,563 |  |  | 427,086 |  |  | 582,477 |
Trademarks and trade names | 119,807 |  |  | — |  |  | 119,807 |  |  | 119,510 |  |  | — |  |  | 119,510 |
Total permits and other intangible assets | $ | 1,132,440 |  |  | $ | 468,475 |  |  | $ | 663,965 |  |  | $ | 1,129,073 |  |  | $ | 427,086 |  |  | $ | 701,987 |
Schedule of Indefinite-Lived Intangible Assets | As of September 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands):
| September 30, 2025 |  | December 31, 2024
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 194,193 |  |  | $ | 130,053 |  |  | $ | 64,140 |  |  | $ | 191,921 |  |  | $ | 123,939 |  |  | $ | 67,982 |
Customer and supplier relationships | 698,036 |  |  | 283,708 |  |  | 414,328 |  |  | 697,326 |  |  | 256,657 |  |  | 440,669 |
Other intangible assets | 120,404 |  |  | 54,714 |  |  | 65,690 |  |  | 120,316 |  |  | 46,490 |  |  | 73,826 |
Total amortizable permits and other intangible assets | 1,012,633 |  |  | 468,475 |  |  | 544,158 |  |  | 1,009,563 |  |  | 427,086 |  |  | 582,477 |
Trademarks and trade names | 119,807 |  |  | — |  |  | 119,807 |  |  | 119,510 |  |  | — |  |  | 119,510 |
Total permits and other intangible assets | $ | 1,132,440 |  |  | $ | 468,475 |  |  | $ | 663,965 |  |  | $ | 1,129,073 |  |  | $ | 427,086 |  |  | $ | 701,987 |
Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets | The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2025 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2025 (three months) | $ | 13,379 |
2026 | 51,727 |
2027 | 49,190 |
2028 | 47,708 |
2029 | 42,097 |
Thereafter | 340,057 |
| $ | 544,158 |

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