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SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Revenues	$ 241,969	$ 202,667	$ 647,375	$ 574,344
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	178,677	153,051	476,696	429,021
Collection
Revenue from External Customer [Line Items]
Revenues	118,872	102,270	323,667	290,837
Disposal
Revenue from External Customer [Line Items]
Revenues	55,593	47,600	142,618	129,971
Power generation
Revenue from External Customer [Line Items]
Revenues	1,253	987	3,657	2,931
Processing
Revenue from External Customer [Line Items]
Revenues	2,959	2,194	6,754	5,282
Resource solutions operations
Revenue from External Customer [Line Items]
Revenues	63,292	49,616	170,679	145,323
Processing
Revenue from External Customer [Line Items]
Revenues	27,418	15,701	65,721	45,724
Non-processing
Revenue from External Customer [Line Items]
Revenues	$ 35,874	$ 33,915	$ 104,958	$ 99,599

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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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