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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 215,875 | $ 188,767 | $ 405,406 | $ 371,676
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 107,327 | 94,008 | 204,796 | 188,568
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,635 | 19,786 | 41,656 | 39,640
Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,451 | 20,454 | 40,022 | 36,507
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,087 | 3,506 | 5,348 | 6,224
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,100 | 918 | 2,403 | 1,944
Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,341 | 18,155 | 42,096 | 33,110
Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,934 | 31,940 | 69,085 | 65,683
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 15,469 | 8,667 | 26,106 | 13,419
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 200,406 | 180,100 | 379,300 | 358,257
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 61,058 | 53,336 | 113,403 | 103,479
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 39,364 | 35,463 | 75,440 | 71,400
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,118 | 4,568 | 11,520 | 8,112
Eastern | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 13,475 | 11,451 | 22,899 | 20,834
Eastern | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 47 | 52 | 95 | 99
Eastern | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 246 | 197 | 515 | 583
Eastern | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,808 | 1,605 | 2,934 | 2,451
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 | 38 | 69 | 82 | 125
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 61,020 | 53,267 | 113,321 | 103,354
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 98,852 | 87,286 | 184,616 | 172,491
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 67,963 | 58,545 | 129,356 | 117,168
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 16,517 | 15,218 | 30,136 | 31,528
Western | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9,976 | 9,003 | 17,123 | 15,673
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,040 | 3,454 | 5,253 | 6,125
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 854 | 721 | 1,888 | 1,361
Western | Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 502 | 345 | 860 | 636
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 | 487 | 367 | 988 | 602
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 98,365 | 86,919 | 183,628 | 171,889
Resource solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 55,965 | 48,145 | 107,387 | 95,706
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 | 21,031 | 16,205 | 38,302 | 30,023
Resource solutions | Non-processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,934 | 31,940 | 69,085 | 65,683
Resource solutions | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,944 | 8,231 | 25,036 | 12,692
Resource solutions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 41,021 | $ 39,914 | $ 82,351 | $ 83,014

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