SEGMENT REPORTING - Segment Information, Revenues, EBITA, and Reconciliation to the Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 5,166,605	$ 3,805,566	$ 3,144,097
Adjusted EBITDA	1,022,128	676,606	573,804
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	12,943	11,745	11,051
Stock-based compensation	26,844	18,839	18,502
Depreciation and amortization	347,594	298,135	292,915
Income from operations	634,747	347,887	251,336
Other (income) expense, net	(2,472)	515	290
Loss on early extinguishment of debt	422	0	0
(Gain) loss on sale of businesses	(8,864)	0	3,376
Interest expense, net of interest income	107,663	77,657	73,120
Income from operations before provision for income taxes	537,998	269,715	174,550
Property, plant and equipment, net	1,980,302	1,863,175
Goodwill	1,246,878	1,227,042	527,023
Permits and other intangibles, net	620,782	644,912
Permits and other intangibles, net	1,867,660	1,871,954
Environmental Services
Segment Reporting Information [Line Items]
Total revenues	4,171,706	3,032,454	2,635,901
Reconciliation to Consolidated Statements of Operations:
Goodwill	1,071,846	1,085,534	401,918
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	994,392	772,813	507,906
Reconciliation to Consolidated Statements of Operations:
Goodwill	175,032	141,508	125,105
Operating segments | Environmental Services
Segment Reporting Information [Line Items]
Total revenues	4,144,973	3,025,907	2,637,641
Adjusted EBITDA	953,053	659,718	665,918
Reconciliation to Consolidated Statements of Operations:
Property, plant and equipment, net	1,467,641	1,374,913
Goodwill	1,071,846	1,085,534
Permits and other intangibles, net	462,050	498,739
Permits and other intangibles, net	1,533,896	1,584,273
Operating segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	1,021,125	779,360	506,166
Adjusted EBITDA	306,327	227,354	83,214
Reconciliation to Consolidated Statements of Operations:
Property, plant and equipment, net	398,660	373,721
Goodwill	175,032	141,508
Permits and other intangibles, net	158,732	146,173
Permits and other intangibles, net	333,764	287,681
Intersegment revenues (expense), net | Environmental Services
Segment Reporting Information [Line Items]
Total revenues	26,733	6,547	(1,740)
Intersegment revenues (expense), net | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Total revenues	(26,733)	(6,547)	1,740
Corporate Items
Segment Reporting Information [Line Items]
Total revenues	507	299	290
Adjusted EBITDA	(237,252)	(210,466)	(175,328)
Reconciliation to Consolidated Statements of Operations:
Property, plant and equipment, net	114,001	114,541
Operating segments and corporate non segment
Segment Reporting Information [Line Items]
Total revenues	$ 507	$ 299	$ 290