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SEGMENT REPORTING - Summary of Revenue Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenues	$ 774,584	$ 743,290	$ 660,660
Revenues percentage	100.00%	100.00%	100.00%
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	$ 578,274	$ 564,687	$ 496,831
Revenues percentage	74.70%	76.00%	75.20%
Collection
Revenue from External Customer [Line Items]
Revenues	$ 391,438	$ 372,041	$ 303,418
Revenues percentage	50.50%	50.10%	45.90%
Disposal
Revenue from External Customer [Line Items]
Revenues	$ 175,546	$ 181,895	$ 181,110
Revenues percentage	22.70%	24.50%	27.40%
Power generation
Revenue from External Customer [Line Items]
Revenues	$ 4,072	$ 3,576	$ 5,129
Revenues percentage	0.50%	0.50%	0.80%
Processing
Revenue from External Customer [Line Items]
Revenues	$ 7,218	$ 7,175	$ 7,174
Revenues percentage	1.00%	0.90%	1.10%
Resource Solutions
Revenue from External Customer [Line Items]
Revenues	$ 196,310	$ 178,603	$ 163,829
Revenues percentage	25.30%	24.00%	24.80%
Organics
Revenue from External Customer [Line Items]
Revenues	$ 59,394	$ 56,326	$ 54,174
Revenues percentage	7.60%	7.50%	8.20%
Customer solutions
Revenue from External Customer [Line Items]
Revenues	$ 86,680	$ 79,457	$ 67,464
Revenues percentage	11.20%	10.70%	10.20%
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 50,236	$ 42,820	$ 42,191
Revenues percentage	6.50%	5.80%	6.40%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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