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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes to Goodwill | The changes in goodwill by segment for the three months ended March 31, 2026 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Totals
Balance at January 1, 2026 | $ | 1,297,478 |  |  | $ | 181,572 |  |  | $ | 1,479,050 |
Increase from current period acquisition | 76,823 |  |  | — |  |  | 76,823 |
Foreign currency translation | (576) |  |  | (235) |  |  | (811) |
Balance at March 31, 2026 | $ | 1,373,725 |  |  | $ | 181,337 |  |  | $ | 1,555,062 |
Schedule of Finite-Lived Intangible Assets | As of March 31, 2026 and December 31, 2025, the Company’s intangible assets consisted of the following (in thousands):
| March 31, 2026 |  | December 31, 2025
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 195,724 |  |  | $ | 133,851 |  |  | $ | 61,873 |  |  | $ | 196,224 |  |  | $ | 132,308 |  |  | $ | 63,916 |
Customer and supplier relationships | 720,514 |  |  | 284,028 |  |  | 436,486 |  |  | 698,381 |  |  | 292,813 |  |  | 405,568 |
Other intangible assets | 121,009 |  |  | 60,085 |  |  | 60,924 |  |  | 121,030 |  |  | 57,438 |  |  | 63,592 |
Total amortizable permits and other intangible assets | 1,037,247 |  |  | 477,964 |  |  | 559,283 |  |  | 1,015,635 |  |  | 482,559 |  |  | 533,076 |
Trademarks and trade names | 119,798 |  |  | — |  |  | 119,798 |  |  | 119,951 |  |  | — |  |  | 119,951 |
Total permits and other intangible assets | $ | 1,157,045 |  |  | $ | 477,964 |  |  | $ | 679,081 |  |  | $ | 1,135,586 |  |  | $ | 482,559 |  |  | $ | 653,027 |
Schedule of Indefinite-Lived Intangible Assets | As of March 31, 2026 and December 31, 2025, the Company’s intangible assets consisted of the following (in thousands):
| March 31, 2026 |  | December 31, 2025
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 195,724 |  |  | $ | 133,851 |  |  | $ | 61,873 |  |  | $ | 196,224 |  |  | $ | 132,308 |  |  | $ | 63,916 |
Customer and supplier relationships | 720,514 |  |  | 284,028 |  |  | 436,486 |  |  | 698,381 |  |  | 292,813 |  |  | 405,568 |
Other intangible assets | 121,009 |  |  | 60,085 |  |  | 60,924 |  |  | 121,030 |  |  | 57,438 |  |  | 63,592 |
Total amortizable permits and other intangible assets | 1,037,247 |  |  | 477,964 |  |  | 559,283 |  |  | 1,015,635 |  |  | 482,559 |  |  | 533,076 |
Trademarks and trade names | 119,798 |  |  | — |  |  | 119,798 |  |  | 119,951 |  |  | — |  |  | 119,951 |
Total permits and other intangible assets | $ | 1,157,045 |  |  | $ | 477,964 |  |  | $ | 679,081 |  |  | $ | 1,135,586 |  |  | $ | 482,559 |  |  | $ | 653,027 |
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 March 31, 2026 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2026 (nine months) | $ | 41,795 |
2027 | 54,184 |
2028 | 52,816 |
2029 | 51,738 |
2030 | 41,163 |
Thereafter | 317,587 |
| $ | 559,283 |

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