GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
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3 Months Ended |
Mar. 31, 2026 |
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| Goodwill and Intangible Assets Disclosure [Abstract] |
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| 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 | |
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| 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 | |
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| 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 | |
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| 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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