REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 457,328	$ 417,101
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	9,550	12,521
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	447,778	404,580
Collection
Disaggregation of Revenue [Line Items]
Total revenues	309,652	276,461
Landfill
Disaggregation of Revenue [Line Items]
Total revenues	21,478	20,917
Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	28,033	27,568
Transportation
Disaggregation of Revenue [Line Items]
Total revenues	4,647	5,214
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	2,935	2,765
Processing
Disaggregation of Revenue [Line Items]
Total revenues	45,099	46,495
National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	45,484	37,681
Eastern
Disaggregation of Revenue [Line Items]
Total revenues	111,287	104,740
Eastern | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	196	96
Eastern | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	111,091	104,644
Eastern | Collection
Disaggregation of Revenue [Line Items]
Total revenues	87,556	81,062
Eastern | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	6,545	6,796
Eastern | Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	13,663	13,680
Eastern | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	1,419	1,348
Eastern | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	663	252
Eastern | Processing
Disaggregation of Revenue [Line Items]
Total revenues	1,441	1,602
Eastern | National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Western
Disaggregation of Revenue [Line Items]
Total revenues	162,448	152,316
Western | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	243	704
Western | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	162,205	151,612
Western | Collection
Disaggregation of Revenue [Line Items]
Total revenues	129,086	118,605
Western | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	14,084	13,434
Western | Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	13,435	13,521
Western | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	3,228	3,866
Western | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	2,272	2,513
Western | Processing
Disaggregation of Revenue [Line Items]
Total revenues	343	377
Western | National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic
Disaggregation of Revenue [Line Items]
Total revenues	94,794	77,848
Mid-Atlantic | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	94,794	77,848
Mid-Atlantic | Collection
Disaggregation of Revenue [Line Items]
Total revenues	93,010	76,794
Mid-Atlantic | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	849	687
Mid-Atlantic | Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	935	367
Mid-Atlantic | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic | Processing
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Mid-Atlantic | National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions
Disaggregation of Revenue [Line Items]
Total revenues	88,799	82,197
Resource Solutions | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	9,111	11,721
Resource Solutions | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	79,688	70,476
Resource Solutions | Collection
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions | Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Resource Solutions | Processing
Disaggregation of Revenue [Line Items]
Total revenues	43,315	44,516
Resource Solutions | National Accounts
Disaggregation of Revenue [Line Items]
Total revenues	$ 45,484	$ 37,681