SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 5,889,952	$ 5,409,152	$ 5,166,605
Total Segment Revenues
Segment Reporting Information [Line Items]
Total revenues	5,889,545	5,408,705	5,166,098
Environmental Services
Segment Reporting Information [Line Items]
Total revenues	5,004,747	4,511,442	4,171,706
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	884,798	897,263	994,392
Intersegment revenues (expense), net | Environmental Services
Segment Reporting Information [Line Items]
Total revenues	44,422	41,533	26,733
Intersegment revenues (expense), net | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	(44,422)	(41,533)	(26,733)
Operating Segments | Total Segment Revenues
Segment Reporting Information [Line Items]
Total revenues	5,889,545	5,408,705	5,166,098
Operating Segments | Environmental Services
Segment Reporting Information [Line Items]
Total revenues	4,960,325	4,469,909	4,144,973
Operating Segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	929,220	938,796	1,021,125
Corporate
Segment Reporting Information [Line Items]
Total revenues	$ 407	$ 447	$ 507