RESTRUCTURING, DIVESTITURES, AND ASSETS HELD FOR SALE - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring charges		$ 13.9
Employee termination		11.5
Non-cash impairment charges		2.4
Payments for restructuring liability	$ 2.2
Assets and Liabilities Held for Sale, Not Discontinued Operations | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges	4.1
Domestic And Canada Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges		5.5
International Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges		3.3
Other
Restructuring Cost And Reserve [Line Items]
Restructuring charges		$ 5.1
Employee Termination Charges
Restructuring Cost And Reserve [Line Items]
Employee termination restructuring charges anticipated	20.0
Employee Termination Charges | Domestic And Canada Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Employee termination restructuring charges anticipated	8.0
Employee Termination Charges | International Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Employee termination restructuring charges anticipated	1.0
Employee Termination Charges | Other
Restructuring Cost And Reserve [Line Items]
Employee termination restructuring charges anticipated	$ 11.0