RESTRUCTURING, DIVESTITURES AND DISPOSAL GROUPS HELD FOR SALE - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		33 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2018	Oct. 31, 2019	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 100,000		$ 2,200,000
Non-cash impairment charges		$ 82,400,000
Proceeds from sale of business				$ 17,800,000	25,200,000
Assets and Liabilities Held for Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Assets held for sale		30,200,000		30,200,000				$ 0
North America | TAS | Subsequent Event
Restructuring Cost And Reserve [Line Items]
Consideration for sale of business							$ 36,400,000
Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges		0		$ 5,300,000
Restructuring charges approximate paid over period				2 years
Restructuring charges future payments accrued		3,900,000		$ 3,900,000
All Other
Restructuring Cost And Reserve [Line Items]
Restructuring charges					200,000
All Other | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges				4,600,000
Severance costs			1,100,000		1,100,000
International Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges					300,000
International Regulated Waste And Compliance Services | United Kingdom
Restructuring Cost And Reserve [Line Items]
Proceeds from sale of business					8,200,000
Consideration for sale of business			11,500,000		11,500,000	$ 11,500,000
Consideration from business sale held in escrow	$ 3,300,000
International Regulated Waste And Compliance Services | United Kingdom | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Proceeds from sale of business				14,900,000
International Regulated Waste And Compliance Services | Mexico
Restructuring Cost And Reserve [Line Items]
Cumulative foreign currency translation adjustment				18,000,000.0
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges				600,000
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Brazil
Restructuring Cost And Reserve [Line Items]
Restructuring charges				1,900,000
Non-cash impairment charges				400,000
Site clean costs				1,000,000.0
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | United Kingdom | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Pre-tax gain (loss) from sale		(700,000)		5,100,000
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | United Kingdom | Assets and Liabilities Held for Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges					4,200,000	$ 14,800,000
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Employee Severance | Brazil
Restructuring Cost And Reserve [Line Items]
Restructuring charges				100,000
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Closure And Exit | Brazil
Restructuring Cost And Reserve [Line Items]
Restructuring charges				400,000
International Regulated Waste And Compliance Services | Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges				2,200,000
International Regulated Waste And Compliance Services | Cost of Revenues | Romania
Restructuring Cost And Reserve [Line Items]
Restructuring charges		1,800,000		1,800,000
Non-cash impairment charges		1,400,000		1,400,000
International Regulated Waste And Compliance Services | Cost of Revenues | Brazil
Restructuring Cost And Reserve [Line Items]
Restructuring charges		900,000
Non-cash impairment charges		400,000
International Regulated Waste And Compliance Services | Cost of Revenues | Employee Severance | Romania
Restructuring Cost And Reserve [Line Items]
Restructuring charges		200,000		200,000
International Regulated Waste And Compliance Services | Cost of Revenues | Employee Severance | Brazil
Restructuring Cost And Reserve [Line Items]
Restructuring charges		100,000
International Regulated Waste And Compliance Services | Cost of Revenues | Closure And Exit | Romania
Restructuring Cost And Reserve [Line Items]
Restructuring charges		200,000		200,000
International Regulated Waste And Compliance Services | Cost of Revenues | Closure And Exit | Brazil
Restructuring Cost And Reserve [Line Items]
Restructuring charges		$ 400,000
Domestic And Canada Regulated Waste And Compliance Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges					1,700,000
Domestic And Canada Regulated Waste And Compliance Services | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges				100,000
Domestic And Canada Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Assets and Liabilities Held for Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges				6,900,000
Domestic And Canada Regulated Waste And Compliance Services | Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Restructuring charges			1,000,000.0		1,000,000.0
Non-cash impairment charges			6,800,000	$ 2,000,000.0	6,800,000
Domestic And Canada Regulated Waste And Compliance Services | Cost of Revenues | Lease Termination Fee
Restructuring Cost And Reserve [Line Items]
Restructuring charges			500,000		500,000
Domestic And Canada Regulated Waste And Compliance Services | Cost of Revenues | Non-cash Leasehold Improvements
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 500,000		$ 500,000