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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 295,268 | $ 241,969 | $ 812,962 | $ 647,375
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 144,117 | 118,872 | 400,910 | 323,667
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 28,140 | 24,823 | 72,847 | 66,479
Transfer station |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 32,755 | 27,323 | 81,486 | 67,345
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,252 | 3,447 | 15,170 | 8,794
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,643 | 1,253 | 6,050 | 3,657
Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,292 | 30,377 | 101,304 | 72,475
Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,069 | 35,874 | 135,195 | 104,958
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12,934 | 20,266 | 48,098 | 46,373
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 282,334 | 221,703 | 764,864 | 601,002
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 93,137 | 75,154 | 251,720 | 188,557
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 61,875 | 48,951 | 172,671 | 124,389
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,900 | 6,622 | 19,819 | 18,143
Eastern | Transfer station |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,525 | 16,948 | 48,431 | 39,847
Eastern | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,233 | 54 | 4,470 | 148
Eastern | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 205 | 269 | 727 | 784
Eastern | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,399 | 2,310 | 5,602 | 5,246
Eastern | Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 115 | 43 | 352 | 125
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 93,022 | 75,111 | 251,368 | 188,432
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 121,903 | 103,523 | 332,626 | 288,139
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 82,242 | 69,921 | 228,239 | 199,278
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,240 | 18,201 | 53,028 | 48,336
Western | Transfer station |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 13,230 | 10,375 | 33,055 | 27,498
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,019 | 3,393 | 10,700 | 8,646
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,438 | 984 | 5,323 | 2,873
Western | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 734 | 649 | 2,281 | 1,508
Western | Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 439 | 296 | 1,467 | 1,284
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 121,464 | 103,227 | 331,159 | 286,855
Resource Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 80,228 | 63,292 | 228,616 | 170,679
Resource Solutions | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Resource Solutions | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Resource Solutions | Transfer station |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Resource Solutions | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Resource Solutions | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Resource Solutions | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 32,159 | 27,418 | 93,421 | 65,721
Resource Solutions | Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,069 | 35,874 | 135,195 | 104,958
Resource Solutions | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12,380 | 19,927 | 46,279 | 44,964
Resource Solutions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 67,848 | $ 43,365 | $ 182,337 | $ 125,715

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