SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Revenues	$ 165,649	$ 154,016	$ 313,104	$ 287,818
Collection
Revenue from External Customer [Line Items]
Revenues	74,564	66,308	141,039	126,145
Disposal
Revenue from External Customer [Line Items]
Revenues	47,246	42,172	87,480	73,454
Power generation
Revenue from External Customer [Line Items]
Revenues	1,295	1,554	3,094	2,906
Processing
Revenue from External Customer [Line Items]
Revenues	2,347	2,137	3,768	3,796
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	125,452	112,171	235,381	206,301
Organics
Revenue from External Customer [Line Items]
Revenues	14,647	11,005	26,847	20,219
Customer solutions
Revenue from External Customer [Line Items]
Revenues	15,950	14,629	31,119	28,452
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 9,600	$ 16,211	$ 19,757	$ 32,846