GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
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6 Months Ended |
Jun. 30, 2025 |
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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 six months ended June 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 | 1,824 | | | 735 | | | 2,559 | | | Balance at June 30, 2025 | $ | 1,298,174 | | | $ | 181,631 | | | $ | 1,479,805 | |
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| Schedule of Finite-Lived Intangible Assets |
As of June 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2025 | | December 31, 2024 | | Cost | | Accumulated
Amortization | | Net | | Cost | | Accumulated
Amortization | | Net | | Permits | $ | 194,062 | | | $ | 128,561 | | | $ | 65,501 | | | $ | 191,921 | | | $ | 123,939 | | | $ | 67,982 | | Customer and supplier relationships | 698,473 | | | 275,162 | | | 423,311 | | | 697,326 | | | 256,657 | | | 440,669 | | Other intangible assets | 120,458 | | | 52,080 | | | 68,378 | | | 120,316 | | | 46,490 | | | 73,826 | | Total amortizable permits and other intangible assets | 1,012,993 | | | 455,803 | | | 557,190 | | | 1,009,563 | | | 427,086 | | | 582,477 | | Trademarks and trade names | 119,990 | | | — | | | 119,990 | | | 119,510 | | | — | | | 119,510 | | Total permits and other intangible assets | $ | 1,132,983 | | | $ | 455,803 | | | $ | 677,180 | | | $ | 1,129,073 | | | $ | 427,086 | | | $ | 701,987 | |
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| Schedule of Indefinite-Lived Intangible Assets |
As of June 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2025 | | December 31, 2024 | | Cost | | Accumulated
Amortization | | Net | | Cost | | Accumulated
Amortization | | Net | | Permits | $ | 194,062 | | | $ | 128,561 | | | $ | 65,501 | | | $ | 191,921 | | | $ | 123,939 | | | $ | 67,982 | | Customer and supplier relationships | 698,473 | | | 275,162 | | | 423,311 | | | 697,326 | | | 256,657 | | | 440,669 | | Other intangible assets | 120,458 | | | 52,080 | | | 68,378 | | | 120,316 | | | 46,490 | | | 73,826 | | Total amortizable permits and other intangible assets | 1,012,993 | | | 455,803 | | | 557,190 | | | 1,009,563 | | | 427,086 | | | 582,477 | | Trademarks and trade names | 119,990 | | | — | | | 119,990 | | | 119,510 | | | — | | | 119,510 | | Total permits and other intangible assets | $ | 1,132,983 | | | $ | 455,803 | | | $ | 677,180 | | | $ | 1,129,073 | | | $ | 427,086 | | | $ | 701,987 | |
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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 June 30, 2025 was as follows (in thousands): | | | | | | | Years Ending December 31, | Expected Amortization | | 2025 (six months) | $ | 26,664 | | | 2026 | 51,494 | | | 2027 | 49,414 | | | 2028 | 48,049 | | | 2029 | 46,971 | | | Thereafter | 334,598 | | | $ | 557,190 | |
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