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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 417,101 | $ 341,008
Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 12,521 | 13,292
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 404,580 | 327,716
Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 276,461 | 211,360
Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 20,917 | 19,552
Transfer station |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 27,568 | 26,474
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 5,214 | 4,113
Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,765 | 2,509
Processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 33,948 | 31,691
National Accounts |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 50,228 | 45,309
Eastern |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 104,740 | 100,191
Eastern | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 96 | 122
Eastern | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 104,644 | 100,069
Eastern | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 81,062 | 75,008
Eastern | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 6,796 | 6,612
Eastern | Transfer station |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 13,680 | 15,454
Eastern | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,348 | 1,390
Eastern | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 252 | 458
Eastern | Processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,602 | 1,269
Eastern | National Accounts |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Western |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 152,316 | 123,643
Western | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 704 | 618
Western | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 151,612 | 123,025
Western | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 118,605 | 95,122
Western | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 13,434 | 12,441
Western | Transfer station |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 13,521 | 10,646
Western | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,866 | 2,723
Western | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,513 | 2,051
Western | Processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 377 | 660
Western | National Accounts |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Mid-Atlantic |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 77,848 | 42,103
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 | 77,848 | 42,103
Mid-Atlantic | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 76,794 | 41,230
Mid-Atlantic | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 687 | 499
Mid-Atlantic | Transfer station |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 367 | 374
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 | 82,197 | 75,071
Resource Solutions | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 11,721 | 12,552
Resource Solutions | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 70,476 | 62,519
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 | 31,969 | 29,762
Resource Solutions | National Accounts |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 50,228 | $ 45,309

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