SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reconciliation to Consolidated Statements of Operations:
Corporate Costs	$ 67,989	$ 64,080
Accretion of environmental liabilities	3,620	3,217
Stock-based compensation	7,635	6,338
Depreciation and amortization	111,980	95,065
Income from operations	111,619	125,475
Other expense, net	932	1,141
Interest expense, net of interest income	36,077	28,539
Income before provision for income taxes	74,610	95,795
Environmental Services
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	274,591	264,475
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	28,252	29,700
Operating Segments
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	302,843	294,175
Operating Segments | Environmental Services
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	274,591	264,475
Operating Segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	$ 28,252	$ 29,700