SEGMENT REPORTING - Schedule of Revenues Attributable to Services Provided (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 543,748	$ 465,334	$ 1,001,076	$ 882,435
Solid waste
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	442,187	373,624	810,717	708,528
Collection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	355,031	297,905	664,682	574,368
Disposal
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	77,148	65,434	126,660	113,916
Transportation
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	5,935	6,145	10,582	11,360
Landfill gas-to-energy
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	1,427	1,556	4,363	4,321
Processing
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	2,646	2,584	4,430	4,563
Resource Solutions
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	101,561	91,710	190,359	173,907
Processing
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	52,890	50,155	96,205	94,671
National Accounts
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 48,671	$ 41,555	$ 94,154	$ 79,236