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SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from External Customer [Line Items]
Revenues	$ 485,351	$ 411,627	$ 1,367,786	$ 1,129,797
Solid waste
Revenue from External Customer [Line Items]
Revenues	392,170	325,165	1,100,698	885,046
Collection
Revenue from External Customer [Line Items]
Revenues	314,048	252,579	888,415	687,896
Disposal
Revenue from External Customer [Line Items]
Revenues	73,445	67,453	198,722	182,716
Landfill gas-to-energy
Revenue from External Customer [Line Items]
Revenues	1,538	1,651	5,859	6,144
Processing
Revenue from External Customer [Line Items]
Revenues	3,139	3,482	7,702	8,290
Resource Solutions
Revenue from External Customer [Line Items]
Revenues	93,181	86,462	267,088	244,751
Processing
Revenue from External Customer [Line Items]
Revenues	33,199	34,954	101,634	97,992
National Accounts
Revenue from External Customer [Line Items]
Revenues	$ 59,982	$ 51,508	$ 165,454	$ 146,759

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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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