BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Allocated as follows:
Excess purchase price allocated to goodwill	$ 119,936		$ 119,899
Transfer Stations Acquisition
Purchase Price:
Cash paid for acquisitions	414	$ 0
Holdback	46	0
Total	460	0
Allocated as follows:
Equipment	170	0
Intangible assets	262	0
Other liabilities, net	(9)	0
Fair value of assets acquired and liabilities assumed	423	0
Excess purchase price allocated to goodwill	$ 37	$ 0