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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer [Line Items]
Revenues	$ 283,666	$ 215,875	$ 517,693	$ 405,406
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	202,147	159,910	369,305	298,019
Collection
Revenue from External Customer [Line Items]
Revenues	137,261	107,327	256,793	204,796
Disposal
Revenue from External Customer [Line Items]
Revenues	60,204	49,173	103,356	87,026
Power generation
Revenue from External Customer [Line Items]
Revenues	1,753	1,100	4,407	2,403
Processing
Revenue from External Customer [Line Items]
Revenues	2,929	2,310	4,749	3,794
Resource Solutions operations
Revenue from External Customer [Line Items]
Revenues	81,519	55,965	148,388	107,387
Processing
Revenue from External Customer [Line Items]
Revenues	33,867	21,031	61,263	38,302
Non-processing
Revenue from External Customer [Line Items]
Revenues	$ 47,652	$ 34,934	$ 87,125	$ 69,085

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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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