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REVENUES (Tables) | 3 Months Ended
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Mar. 31, 2026
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables present the Company’s third-party revenue disaggregated by source of revenue and geography in total and for the Environmental Services and SKSS operating segments and Corporate (in thousands):
|  | Three Months Ended March 31, 2026
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,151,108 |  |  | $ | 200,273 |  |  | $ | — |  |  | $ | 1,351,381 |
Canada |  | 91,340 |  |  | 16,816 |  |  | — |  |  | 108,156 |
Total third-party revenues |  | $ | 1,242,448 |  |  | $ | 217,089 |  |  | $ | — |  |  | $ | 1,459,537 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 448,313 |  |  | $ | — |  |  | $ | — |  |  | $ | 448,313 |
Industrial Services and Other |  | 302,561 |  |  | — |  |  | — |  |  | 302,561 |
Field and Emergency Response Services |  | 231,358 |  |  | — |  |  | — |  |  | 231,358 |
Safety-Kleen Environmental Services |  | 260,216 |  |  | 77,973 |  |  | — |  |  | 338,189 |
Safety-Kleen Oil |  | — |  |  | 139,116 |  |  | — |  |  | 139,116 |
Total third-party revenues |  | $ | 1,242,448 |  |  | $ | 217,089 |  |  | $ | — |  |  | $ | 1,459,537 |
|  | Three Months Ended March 31, 2025
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,116,267 |  |  | $ | 200,019 |  |  | $ | 97 |  |  | $ | 1,316,383 |
Canada |  | 90,771 |  |  | 24,796 |  |  | — |  |  | 115,567 |
Total third-party revenues |  | $ | 1,207,038 |  |  | $ | 224,815 |  |  | $ | 97 |  |  | $ | 1,431,950 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 426,205 |  |  | $ | — |  |  | $ | — |  |  | $ | 426,205 |
Industrial Services and Other |  | 322,358 |  |  | — |  |  | 97 |  |  | 322,455 |
Field and Emergency Response Services |  | 215,702 |  |  | — |  |  | — |  |  | 215,702 |
Safety-Kleen Environmental Services |  | 242,773 |  |  | 64,901 |  |  | — |  |  | 307,674 |
Safety-Kleen Oil |  | — |  |  | 159,914 |  |  | — |  |  | 159,914 |
Total third-party revenues |  | $ | 1,207,038 |  |  | $ | 224,815 |  |  | $ | 97 |  |  | $ | 1,431,950 |
Schedule of Contract Balances |
(in thousands) |  | March 31, 2026 |  | December 31, 2025
Receivables |  | $ | 1,113,163 |  |  | $ | 1,044,137 |
Contract assets (unbilled receivables) |  | 192,241 |  |  | 160,888 |
Contract liabilities (deferred revenue) |  | 82,858 |  |  | 81,529 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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