SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from External Customer [Line Items]
Revenues	$ 182,910	$ 163,664
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	135,349	121,148
Collection
Revenue from External Customer [Line Items]
Revenues	94,577	83,080
Disposal
Revenue from External Customer [Line Items]
Revenues	38,625	36,054
Power generation
Revenue from External Customer [Line Items]
Revenues	1,026	1,136
Processing
Revenue from External Customer [Line Items]
Revenues	1,121	878
Resource solutions operations
Revenue from External Customer [Line Items]
Revenues	47,561	42,516
Organics
Revenue from External Customer [Line Items]
Revenues	14,932	13,596
Customer solutions
Revenue from External Customer [Line Items]
Revenues	21,663	18,154
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 10,966	$ 10,766