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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 241,969 | $ 202,667 | $ 647,375 | $ 574,344
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 118,872 | 102,270 | 323,667 | 290,837
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,823 | 23,574 | 66,479 | 63,216
Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 27,323 | 21,617 | 67,345 | 58,124
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,447 | 2,409 | 8,794 | 8,631
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,253 | 987 | 3,657 | 2,931
Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 30,377 | 17,895 | 72,475 | 51,006
Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,874 | 33,915 | 104,958 | 99,599
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,266 | 8,135 | 46,373 | 21,554
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 221,703 | 194,532 | 601,002 | 552,790
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 75,154 | 58,323 | 188,557 | 161,803
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,951 | 38,659 | 124,389 | 110,059
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,622 | 5,694 | 18,143 | 13,807
Eastern | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 16,948 | 11,861 | 39,847 | 32,695
Eastern | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 54 | 61 | 148 | 159
Eastern | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 269 | 210 | 784 | 793
Eastern | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,310 | 1,838 | 5,246 | 4,290
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 | 43 | 52 | 125 | 177
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 75,111 | 58,271 | 188,432 | 161,626
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 103,523 | 94,728 | 288,139 | 267,218
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 69,921 | 63,611 | 199,278 | 180,778
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,201 | 17,880 | 48,336 | 49,409
Western | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 10,375 | 9,756 | 27,498 | 25,429
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,393 | 2,348 | 8,646 | 8,472
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 984 | 777 | 2,873 | 2,138
Western | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 649 | 356 | 1,508 | 992
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 | 296 | 347 | 1,284 | 949
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 103,227 | 94,381 | 286,855 | 266,269
Resource solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 63,292 | 49,616 | 170,679 | 145,323
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 |  |  |  |
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 | 27,418 | 15,701 | 65,721 | 45,724
Resource solutions | Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,874 | 33,915 | 104,958 | 99,599
Resource solutions | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,927 | 7,736 | 44,964 | 20,428
Resource solutions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 43,365 | $ 41,880 | $ 125,715 | $ 124,895

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