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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2025
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 thousands):
|  | Three Months Ended September 30, 2025
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,194,300 |  |  | $ | 202,483 |  |  | $ | — |  |  | $ | 1,396,783 |
Canada |  | 124,280 |  |  | 28,274 |  |  | — |  |  | 152,554 |
Total third-party revenues |  | $ | 1,318,580 |  |  | $ | 230,757 |  |  | $ | — |  |  | $ | 1,549,337 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 490,768 |  |  | $ | — |  |  | $ | — |  |  | $ | 490,768 |
Industrial Services |  | 332,102 |  |  | — |  |  | — |  |  | 332,102 |
Field and Emergency Response Services |  | 232,262 |  |  | — |  |  | — |  |  | 232,262 |
Safety-Kleen Environmental Services |  | 263,448 |  |  | 76,601 |  |  | — |  |  | 340,049 |
Safety-Kleen Oil |  | — |  |  | 154,156 |  |  | — |  |  | 154,156 |
Total third-party revenues |  | $ | 1,318,580 |  |  | $ | 230,757 |  |  | $ | — |  |  | $ | 1,549,337 |
|  | Three Months Ended September 30, 2024
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,166,660 |  |  | $ | 218,963 |  |  | $ | 96 |  |  | $ | 1,385,719 |
Canada |  | 120,990 |  |  | 22,713 |  |  | — |  |  | 143,703 |
Total third-party revenues |  | $ | 1,287,650 |  |  | $ | 241,676 |  |  | $ | 96 |  |  | $ | 1,529,422 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 437,180 |  |  | $ | — |  |  | $ | — |  |  | $ | 437,180 |
Industrial Services |  | 345,573 |  |  | — |  |  | 96 |  |  | 345,669 |
Field and Emergency Response Services |  | 260,200 |  |  | — |  |  | — |  |  | 260,200 |
Safety-Kleen Environmental Services |  | 244,697 |  |  | 59,675 |  |  | — |  |  | 304,372 |
Safety-Kleen Oil |  | — |  |  | 182,001 |  |  | — |  |  | 182,001 |
Total third-party revenues |  | $ | 1,287,650 |  |  | $ | 241,676 |  |  | $ | 96 |  |  | $ | 1,529,422 |
|  | Nine Months Ended September 30, 2025
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 3,519,337 |  |  | $ | 596,612 |  |  | $ | 186 |  |  | $ | 4,116,135 |
Canada |  | 336,340 |  |  | 78,666 |  |  | — |  |  | 415,006 |
Total third-party revenues |  | $ | 3,855,677 |  |  | $ | 675,278 |  |  | $ | 186 |  |  | $ | 4,531,141 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,380,394 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,380,394 |
Industrial Services |  | 1,016,040 |  |  | — |  |  | 186 |  |  | 1,016,226 |
Field and Emergency Response Services |  | 690,755 |  |  | — |  |  | — |  |  | 690,755 |
Safety-Kleen Environmental Services |  | 768,488 |  |  | 213,965 |  |  | — |  |  | 982,453 |
Safety-Kleen Oil |  | — |  |  | 461,313 |  |  | — |  |  | 461,313 |
Total third-party revenues |  | $ | 3,855,677 |  |  | $ | 675,278 |  |  | $ | 186 |  |  | $ | 4,531,141 |
|  | Nine Months Ended September 30, 2024
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 3,395,446 |  |  | $ | 645,664 |  |  | $ | 297 |  |  | $ | 4,041,407 |
Canada |  | 350,781 |  |  | 66,648 |  |  | — |  |  | 417,429 |
Total third-party revenues |  | $ | 3,746,227 |  |  | $ | 712,312 |  |  | $ | 297 |  |  | $ | 4,458,836 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,288,339 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,288,339 |
Industrial Services |  | 1,064,441 |  |  | — |  |  | 297 |  |  | 1,064,738 |
Field and Emergency Response Services |  | 676,562 |  |  | — |  |  | — |  |  | 676,562 |
Safety-Kleen Environmental Services |  | 716,885 |  |  | 171,117 |  |  | — |  |  | 888,002 |
Safety-Kleen Oil |  | — |  |  | 541,195 |  |  | — |  |  | 541,195 |
Total third-party revenues |  | $ | 3,746,227 |  |  | $ | 712,312 |  |  | $ | 297 |  |  | $ | 4,458,836 |
Schedule of Contract Balances |
(in thousands) |  | September 30, 2025 |  | December 31, 2024
Receivables |  | $ | 1,104,805 |  |  | $ | 1,015,357 |
Contract assets (unbilled receivables) |  | 182,059 |  |  | 162,215 |
Contract liabilities (deferred revenue) |  | 91,966 |  |  | 88,545 |

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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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