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SEGMENT REPORTING
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
SEGMENT REPORTING SEGMENT REPORTING 
Segment reporting is prepared on the same basis that the Company’s chief operating decision maker (the “CODM”), which is a committee comprised of the Company’s Co-Chief Executive Officers, manages the business, makes operating decisions and assesses performance. The Company is managed and reports as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment.
Third-party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment providing the product or service. Intersegment revenues represent the sharing of third-party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third-party. The intersegment revenues are shown net. The operations not managed through the Company’s operating segments described above are recorded as “Corporate.” Although such transactions are excluded from the business segment results, they are included in reported consolidated earnings.
The following tables reconcile third-party revenues to direct revenues by reportable segment (in thousands):
 For the Three Months Ended September 30, 2025
 Environmental
Services		Safety-Kleen Sustainability SolutionsTotal
Segment Revenues		CorporateTotal Consolidated Revenues
Third-party revenues$1,318,580 $230,757 $1,549,337 $— $1,549,337 
Intersegment revenues (expense), net12,720 (12,720)— — — 
Direct revenues$1,331,300 $218,037 $1,549,337 $— $1,549,337 
 For the Three Months Ended September 30, 2024
 Environmental
Services		Safety-Kleen Sustainability SolutionsTotal
Segment Revenues		CorporateTotal Consolidated Revenues
Third-party revenues$1,287,650 $241,676 $1,529,326 $96 $1,529,422 
Intersegment revenues (expense), net9,537 (9,537)— — — 
Direct revenues$1,297,187 $232,139 $1,529,326 $96 $1,529,422 
 For the Nine Months Ended September 30, 2025
 Environmental
Services		Safety-Kleen Sustainability SolutionsTotal
Segment Revenues		CorporateTotal Consolidated Revenues
Third-party revenues$3,855,677 $675,278 $4,530,955 $186 $4,531,141 
Intersegment revenues (expense), net36,771 (36,771)— — — 
Direct revenues$3,892,448 $638,507 $4,530,955 $186 $4,531,141 
 For the Nine Months Ended September 30, 2024
 Environmental
Services		Safety-Kleen Sustainability SolutionsTotal
Segment Revenues		CorporateTotal Consolidated Revenues
Third-party revenues$3,746,227 $712,312 $4,458,539 $297 $4,458,836 
Intersegment revenues (expense), net32,853 (32,853)— — — 
Direct revenues$3,779,080 $679,459 $4,458,539 $297 $4,458,836 
The primary financial measure by which the CODM evaluates the performance of its segments is Adjusted EBITDA, which consists of net income plus accretion of environmental liabilities, stock-based compensation, depreciation and amortization, net interest expense and provision for income taxes and excludes other transactions not deemed representative of fundamental segment results and other (income) expense, net. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.
The CODM uses Adjusted EBITDA to enhance their understanding of segment operating performance, which represents the Company’s performance in the ordinary, ongoing and customary course of operations. The reportable segment operating performance Adjusted EBITDA is used by the CODM to make key operating decisions such as the allocation of resources. Total assets by segment are not used by the CODM to assess the performance of, or allocate resources to, the Company’s segments. Therefore total assets by segment are not disclosed.
The tables below present total Reportable Segment Adjusted EBITDA and the relevant significant segment expenses provided to the CODM by reported segment (in thousands):
For the Three Months Ended September 30, 2025
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$1,331,300 $218,037 $1,549,337 
Cost of Revenues871,487 158,545 1,030,032 
Selling, General and Administrative Expenses102,584 18,555 121,139 
Total Reportable Segment Adjusted EBITDA$357,229 $40,937 $398,166 
For the Three Months Ended September 30, 2024
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$1,297,187 $232,139 $1,529,326 
Cost of Revenues874,414 171,120 1,045,534 
Selling, General and Administrative Expenses90,271 19,793 110,064 
Total Reportable Segment Adjusted EBITDA$332,502 $41,226 $373,728 
For the Nine Months Ended September 30, 2025
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$3,892,448 $638,507 $4,530,955 
Cost of Revenues2,592,300 476,550 3,068,850 
Selling, General and Administrative Expenses292,134 54,455 346,589 
Total Reportable Segment Adjusted EBITDA$1,008,014 $107,502 $1,115,516 
For the Nine Months Ended September 30, 2024
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$3,779,080 $679,459 $4,458,539 
Cost of Revenues2,541,017 496,441 3,037,458 
Selling, General and Administrative Expenses281,171 60,616 341,787 
Total Reportable Segment Adjusted EBITDA$956,892 $122,402 $1,079,294 
The following table presents Total Reportable Segment Adjusted EBITDA reconciled to income from operations before provision for income taxes (in thousands):
 Three Months EndedNine Months Ended
September 30,September 30,
 2025202420252024
Adjusted EBITDA:  
Environmental Services$357,229 $332,502 $1,008,014 $956,892 
Safety-Kleen Sustainability Solutions40,937 41,226 107,502 122,402 
Total Reportable Segment Adjusted EBITDA398,166 373,728 1,115,516 1,079,294 
Reconciliation to Consolidated Statements of Operations:  
Corporate Costs(1)
78,007 71,914 224,266 219,569 
Accretion of environmental liabilities3,499 3,618 10,710 10,139 
Stock-based compensation8,922 5,837 22,620 20,690 
Depreciation and amortization114,729 100,063 342,994 295,632 
Income from operations193,009 192,296 514,926 533,264 
Other (income) expense, net(3,517)1,123 (1,982)2,431 
Interest expense, net of interest income35,700 35,779 108,883 100,767 
Income from operations before provision for income taxes$160,826 $155,394 $408,025 $430,066 
________________
(1)    Corporate Costs include certain revenue, cost of revenues and selling, general and administrative expenses not managed through the Company’s operating segments. These costs are not captured within the Company’s Reportable Segment Adjusted EBITDA, but are included in the Company’s total Adjusted EBITDA balances.