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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 189,532 | $ 182,910
Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 97,469 | 94,561
Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 19,022 | 19,854
Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 16,570 | 16,053
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,261 | 2,718
Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,303 | 1,026
Processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 18,756 | 14,955
Non-processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 34,151 | 33,743
Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 10,637 | 4,753
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 178,895 | 178,157
Eastern |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 52,345 | 50,143
Eastern | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 36,076 | 35,938
Eastern | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 5,403 | 3,544
Eastern | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 9,424 | 9,383
Eastern | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 48 | 47
Eastern | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 268 | 385
Eastern | Processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,126 | 846
Eastern | Non-processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Eastern | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 44 | 56
Eastern | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 52,301 | 50,087
Western |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 85,764 | 85,206
Western | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 61,393 | 58,623
Western | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 13,619 | 16,310
Western | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 7,146 | 6,670
Western | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,213 | 2,671
Western | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,035 | 641
Western | Processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 358 | 291
Western | Non-processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Western | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 501 | 235
Western | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 85,263 | 84,971
Resource Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 51,423 | 47,561
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 |  |
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 | 17,272 | 13,818
Resource Solutions | Non-processing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 34,151 | 33,743
Resource Solutions | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 10,092 | 4,462
Resource Solutions | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 41,331 | $ 43,099

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