BUSINESS COMBINATIONS - Narrative (Detail)	12 Months Ended
	Dec. 31, 2019 vote transfer_station	Dec. 31, 2018 transfer_station vote	Dec. 31, 2017 transfer_station
Business Acquisition [Line Items]
Number of businesses acquired	9	9	4
Intangible assets, useful life	10 years
Minimum
Business Acquisition [Line Items]
Intangible assets, useful life	5 years
Maximum
Business Acquisition [Line Items]
Intangible assets, useful life	10 years
Eastern | Solid Waste Collection Business
Business Acquisition [Line Items]
Number of businesses acquired	3		1
Eastern | Collection Business
Business Acquisition [Line Items]
Number of businesses acquired		2
Western | Solid Waste Collection Business
Business Acquisition [Line Items]
Number of businesses acquired	4	6	3
Western | Transfer Business
Business Acquisition [Line Items]
Number of businesses acquired		1