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SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Total revenues	$ 1,549,337	$ 1,529,422	$ 4,531,141	$ 4,458,836
Total Segment Revenues
Segment Reporting Information [Line Items]
Total revenues	1,549,337	1,529,326	4,530,955	4,458,539
Environmental Services
Segment Reporting Information [Line Items]
Total revenues	1,331,300	1,297,187	3,892,448	3,779,080
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	218,037	232,139	638,507	679,459
Operating Segments | Total Segment Revenues
Segment Reporting Information [Line Items]
Total revenues	1,549,337	1,529,326	4,530,955	4,458,539
Operating Segments | Environmental Services
Segment Reporting Information [Line Items]
Total revenues	1,318,580	1,287,650	3,855,677	3,746,227
Operating Segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	230,757	241,676	675,278	712,312
Intersegment revenues (expense), net | Environmental Services
Segment Reporting Information [Line Items]
Total revenues	12,720	9,537	36,771	32,853
Intersegment revenues (expense), net | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	(12,720)	(9,537)	(36,771)	(32,853)
Corporate
Segment Reporting Information [Line Items]
Total revenues	$ 0	$ 96	$ 186	$ 297

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