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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 283,666 | $ 215,875 | $ 517,693 | $ 405,406
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 137,261 | 107,327 | 256,793 | 204,796
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 25,141 | 22,635 | 44,706 | 41,656
Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 29,274 | 23,451 | 48,730 | 40,022
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,789 | 3,087 | 9,920 | 5,348
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,753 | 1,100 | 4,407 | 2,403
Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 36,796 | 23,341 | 66,012 | 42,096
Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 47,652 | 34,934 | 87,125 | 69,085
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,447 | 15,469 | 35,164 | 26,106
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 264,219 | 200,406 | 482,529 | 379,300
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 87,263 | 61,058 | 158,582 | 113,403
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,299 | 39,364 | 110,796 | 75,440
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,542 | 6,118 | 11,918 | 11,520
Eastern | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17,292 | 13,475 | 28,905 | 22,899
Eastern | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,765 | 47 | 3,238 | 95
Eastern | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 249 | 246 | 522 | 515
Eastern | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,116 | 1,808 | 3,203 | 2,934
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 | 117 | 38 | 236 | 82
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 87,146 | 61,020 | 158,346 | 113,321
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 114,884 | 98,852 | 210,723 | 184,616
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 77,962 | 67,963 | 145,997 | 129,356
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,599 | 16,517 | 32,788 | 30,136
Western | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,982 | 9,976 | 19,825 | 17,123
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,024 | 3,040 | 6,682 | 5,253
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,504 | 854 | 3,885 | 1,888
Western | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 813 | 502 | 1,546 | 860
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 | 517 | 487 | 1,028 | 988
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 114,367 | 98,365 | 209,695 | 183,628
Resource Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 81,519 | 55,965 | 148,388 | 107,387
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 | 33,867 | 21,031 | 61,263 | 38,302
Resource Solutions | Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 47,652 | 34,934 | 87,125 | 69,085
Resource Solutions | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,813 | 14,944 | 33,900 | 25,036
Resource Solutions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 62,706 | $ 41,021 | $ 114,488 | $ 82,351

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