GOODWILL AND INTANGIBLE ASSETS - Schedule of Activity and Balances Related to Goodwill by Operating Segment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 119,899
Acquisitions	37
Goodwill, ending balance	119,936
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	17,429
Acquisitions	0
Goodwill, ending balance	17,429
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	88,426
Acquisitions	37
Goodwill, ending balance	88,463
Recycling
Goodwill [Roll Forward]
Goodwill, beginning balance	12,315
Acquisitions	0
Goodwill, ending balance	12,315
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	1,729
Acquisitions	0
Goodwill, ending balance	$ 1,729