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SEGMENT REPORTING
 3 Months Ended
Mar. 31, 2025
Segment Reporting [Abstract]  
SEGMENT REPORTING SEGMENT REPORTING 
Segment reporting is prepared on the same basis that the Company’s chief operating decision maker (“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 March 31, 2025
 Environmental
Services		Safety-Kleen Sustainability SolutionsTotal
Segment Revenues		CorporateTotal Consolidated Revenues
Third-party revenues$1,207,038 $224,815 $1,431,853 $97 $1,431,950 
Intersegment revenues (expense), net2,075 (2,075)— — — 
Direct revenues$1,209,113 $222,740 $1,431,853 $97 $1,431,950 
 For the Three Months Ended March 31, 2024
 Environmental
Services		Safety-Kleen Sustainability SolutionsTotal
Segment Revenues		CorporateTotal Consolidated Revenues
Third-party revenues$1,161,279 $215,314 $1,376,593 $102 $1,376,695 
Intersegment revenues (expense), net11,231 (11,231)— — — 
Direct revenues$1,172,510 $204,083 $1,376,593 $102 $1,376,695 
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, loss on early extinguishment of debt and provision for income taxes and excludes other transactions not deemed representative of fundamental segment results and other 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 March 31, 2025
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$1,209,113 $222,740 $1,431,853 
Cost of Revenues839,942 177,438 1,017,380 
Selling, General and Administrative Expenses94,580 17,050 111,630 
Total Reportable Segment Adjusted EBITDA$274,591 $28,252 $302,843 
For the Three Months Ended March 31, 2024
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal Reportable Segments
Direct Revenues$1,172,510 $204,083 $1,376,593 
Cost of Revenues812,898 154,887 967,785 
Selling, General and Administrative Expenses95,137 19,496 114,633 
Total Reportable Segment Adjusted EBITDA$264,475 $29,700 $294,175 
The following table presents Total Reportable Segment Adjusted EBITDA reconciled to income from operations before provision for income taxes (in thousands):
 Three Months Ended
March 31,
 20252024
Adjusted EBITDA:
Environmental Services$274,591 $264,475 
Safety-Kleen Sustainability Solutions28,252 29,700 
Total Reportable Segment Adjusted EBITDA302,843 294,175 
Reconciliation to Consolidated Statements of Operations:
Corporate Costs(1)
67,989 64,080 
Accretion of environmental liabilities3,620 3,217 
Stock-based compensation7,635 6,338 
Depreciation and amortization111,980 95,065 
Income from operations111,619 125,475 
Other expense, net932 1,141 
Interest expense, net of interest income36,077 28,539 
Income from operations before provision for income taxes$74,610 $95,795 
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(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.