SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation to Consolidated Statements of Operations:
Corporate Costs	$ 297,534	$ 261,911	$ 237,252
Accretion of environmental liabilities	13,456	13,667	12,943
Stock-based compensation	27,981	20,703	26,844
Depreciation and amortization	400,922	365,761	347,594
Kimball startup costs	4,343	0	0
Income from operations	670,232	612,439	634,747
Other expense (income), net	1,454	(2,315)	(2,472)
Loss on early extinguishment of debt	371	2,880	422
Gain on sale of business	0	0	(8,864)
Interest expense, net of interest income	134,964	108,595	107,663
Income before provision for income taxes	533,443	503,279	537,998
Environmental Services
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	1,267,462	1,101,608	953,053
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	147,006	172,873	306,327
Operating segments
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	1,414,468	1,274,481	1,259,380
Operating segments | Environmental Services
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	1,267,462	1,101,608	953,053
Operating segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total Reportable Segment Adjusted EBITDA	$ 147,006	$ 172,873	$ 306,327