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SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Revenues	$ 215,875	$ 188,767	$ 405,406	$ 371,676
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	159,910	140,622	298,019	275,970
Collection
Revenue from External Customer [Line Items]
Revenues	107,327	94,008	204,796	188,568
Disposal
Revenue from External Customer [Line Items]
Revenues	49,173	43,746	87,026	82,371
Power generation
Revenue from External Customer [Line Items]
Revenues	1,100	918	2,403	1,944
Processing
Revenue from External Customer [Line Items]
Revenues	2,310	1,950	3,794	3,087
Resource solutions operations
Revenue from External Customer [Line Items]
Revenues	55,965	48,145	107,387	95,706
Processing
Revenue from External Customer [Line Items]
Revenues	21,031	16,205	38,302	30,023
Non-processing
Revenue from External Customer [Line Items]
Revenues	$ 34,934	$ 31,940	$ 69,085	$ 65,683

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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