SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Revenues	$ 147,455	$ 133,802
Collection
Revenue from External Customer [Line Items]
Revenues	66,475	59,838
Disposal
Revenue from External Customer [Line Items]
Revenues	40,234	31,281
Power generation
Revenue from External Customer [Line Items]
Revenues	1,799	1,352
Processing
Revenue from External Customer [Line Items]
Revenues	1,420	1,660
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	109,928	94,131
Organics
Revenue from External Customer [Line Items]
Revenues	12,200	9,214
Customer solutions
Revenue from External Customer [Line Items]
Revenues	15,170	13,822
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 10,157	$ 16,635