COMMITMENTS AND CONTINGENCIES - Self Insurance Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Product Liability Contingency [Line Items]
Retention for environmental impairment	$ 1,000
Annual aggregate self-insured corridor retention amount	5,000
Self-Insurance Liabilities	$ 82,800	$ 65,600
Weighted average risk free discount rate for self insurance liabilities	0.97%	0.29%
Self Insurance Losses Expected [Abstract]
2022	$ 29,956
2023	17,569
2024	12,113
2025	8,003
2026	6,250
Thereafter	9,930
Undiscounted self-insurance liabilities	83,821
Less: Discount	(1,051)
Total self-insurance liabilities (included in accrued expenses)	82,770
Minimum
Product Liability Contingency [Line Items]
Deductible medical insurance policy	900
Safety-Kleen Sustainability Solutions
Product Liability Contingency [Line Items]
Deductible per occurrence for workers compensation	1,000
Deductible per occurrence for general liability	2,000
Deductible per occurrence for vehicle liability	$ 2,000