RESTRUCTURING, DIVESTITURES AND IMPAIRMENTS - Additional Information (Detail) - USD ($)			3 Months Ended				6 Months Ended
	Aug. 03, 2020	Apr. 06, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]
Divestiture losses (gains), net			$ 3,800,000		$ 300,000		$ 62,100,000	$ (5,100,000)
Proceeds from divestiture of businesses							427,700,000	13,600,000
Pre-tax gain (loss) from sale			(3,800,000)		(300,000)		(62,100,000)	5,100,000
HSA [Member]
Restructuring Cost And Reserve [Line Items]
Allocated and deferred transaction proceeds		$ 17,700,000
TSA [Member]
Restructuring Cost And Reserve [Line Items]
Allocated and deferred transaction proceeds		1,500,000
Domestic Environmental Solutions Less Retained Business
Restructuring Cost And Reserve [Line Items]
Sale price for transaction		$ 462,500,000
Divestiture losses (gains), net			3,800,000
Recognized non-cash impairment charge				$ 58,300,000
Estimated deal costs				$ 10,800,000
Pre-tax gain (loss) from sale			(3,800,000)
Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges								5,300,000
Accrued Liabilities
Restructuring Cost And Reserve [Line Items]
Restructuring charges future payments accrued			1,700,000				1,700,000
International Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge							0
International Regulated Waste And Compliance Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations | United Kingdom
Restructuring Cost And Reserve [Line Items]
Proceeds from divestiture of businesses						$ 14,900,000
International Regulated Waste And Compliance Services | Divestiture Losses (Gains) | Disposal Group, Disposed of by Sale, Not Discontinued Operations | United Kingdom
Restructuring Cost And Reserve [Line Items]
Divestiture losses (gains), net						(5,800,000)
Pre-tax gain (loss) from sale						5,800,000
International Regulated Waste And Compliance Services | Subsequent Event
Restructuring Cost And Reserve [Line Items]
Divestiture losses (gains), net	$ 115,000,000
Proceeds from divestiture of businesses	3,900,000
Pre-tax gain (loss) from sale	(115,000,000)
Realized loss from sale	$ 87,000,000
Percentage of net sales of a sale on total sales	1.00%
North America Regulated Waste And Compliance Services | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge					2,100,000			2,100,000
North America Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Long Lived Assets
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge					400,000			400,000
North America Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Customer Lists
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge					$ 1,700,000			1,700,000
North America Regulated Waste And Compliance Services | Costs Related To Rationalizing Operations
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge								$ 1,600,000
North America Regulated Waste And Compliance Services | Software Application Assets | Brazil [Member]
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge			6,200,000				10,200,000
North America Regulated Waste And Compliance Services | Software Application Assets | Brazil [Member]
Restructuring Cost And Reserve [Line Items]
Recognized non-cash impairment charge			$ 2,100,000				$ 2,100,000
Notes Receivable | International Regulated Waste And Compliance Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations | United Kingdom
Restructuring Cost And Reserve [Line Items]
Proceeds from divestiture of businesses						$ 1,300,000