SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenues	$ 154,016	$ 144,670	$ 287,818	$ 270,103
Collection
Revenue from External Customer [Line Items]
Revenues	66,308	63,685	126,145	121,536
Disposal
Revenue from External Customer [Line Items]
Revenues	42,172	39,384	73,454	71,637
Power generation
Revenue from External Customer [Line Items]
Revenues	1,554	1,460	2,906	3,167
Processing
Revenue from External Customer [Line Items]
Revenues	2,137	1,747	3,796	2,720
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	112,171	106,276	206,301	199,060
Organics
Revenue from External Customer [Line Items]
Revenues	11,005	12,171	20,219	21,106
Customer solutions
Revenue from External Customer [Line Items]
Revenues	14,629	13,407	28,452	26,483
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 16,211	$ 12,816	$ 32,846	$ 23,454