GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Intangible Assets By Major Class [Line Items]
Non-cash goodwill write-off			$ 5.9		$ 7.1
Aggregate intangible asset amortization expense	$ 32.9	$ 29.5	$ 64.8	$ 58.6	118.4
Customer relationships
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life			11 years 2 months 12 days
Customer relationships | Minimum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life			10 years
Customer relationships | Maximum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life			30 years
Tradenames
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life			17 years 9 months 18 days
Tradenames | Minimum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life			4 years
Tradenames | Maximum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life			40 years
Covenants not-to-compete
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life			2 years 6 months
Covenants not-to-compete | Minimum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life			5 years
Covenants not-to-compete | Maximum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life			14 years
Other intangibles
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life			16 years 3 months 18 days
Domestic And Canada Regulated Waste And Compliance Services
Intangible Assets By Major Class [Line Items]
Non-cash goodwill write-off			$ 5.8		0.0
Aggregate intangible asset amortization expense	24.2	21.9	47.4	43.6
Domestic And Canada Regulated Waste And Compliance Services | Customer relationships
Intangible Assets By Major Class [Line Items]
Reclassification of intangibles to assets held for sale	14.4		14.4
Definite-lived assets non-cash write-off / Customer relationship intangibles			0.5
International Regulated Waste And Compliance Services
Intangible Assets By Major Class [Line Items]
Non-cash goodwill write-off			0.1		$ 7.1
Aggregate intangible asset amortization expense	$ 6.6	$ 5.5	13.2	$ 10.9
International Regulated Waste And Compliance Services | Operating permits
Intangible Assets By Major Class [Line Items]
Indefinite-lived assets impairment charges			1.2
International Regulated Waste And Compliance Services | Customer relationships
Intangible Assets By Major Class [Line Items]
Definite-lived assets non-cash write-off / Customer relationship intangibles			3.0
International Regulated Waste And Compliance Services | Tradenames
Intangible Assets By Major Class [Line Items]
Indefinite-lived assets impairment charges			$ 1.0