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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 188,767 | $ 187,459 | $ 371,676 | $ 351,123
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8,667 | 6,735 | 13,419 | 13,471
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 180,100 | 180,724 | 358,257 | 337,652
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 95,661 | 93,106 | 191,129 | 176,665
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,786 | 24,282 | 39,640 | 43,467
Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,467 | 20,520 | 36,556 | 34,781
Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,239 | 19,216 | 41,902 | 37,370
Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12,823 | 11,432 | 24,030 | 22,640
Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 15,419 | 14,905 | 30,351 | 28,501
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,454 | 3,287 | 6,124 | 5,852
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 918 | 711 | 1,944 | 1,847
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 53,336 | 57,076 | 103,479 | 104,073
Eastern | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 69 | 52 | 125 | 88
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 53,267 | 57,024 | 103,354 | 103,985
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 37,115 | 38,955 | 73,944 | 72,919
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,568 | 5,427 | 8,112 | 9,144
Eastern | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,451 | 11,923 | 20,834 | 20,909
Eastern | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4 | 577 | 6 | 578
Eastern | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 198 | 194 | 583 | 523
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 87,286 | 85,748 | 172,491 | 159,899
Western | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 367 | 178 | 602 | 487
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 86,919 | 85,570 | 171,889 | 159,412
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 58,546 | 54,151 | 117,185 | 103,746
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 15,218 | 18,855 | 31,528 | 34,323
Western | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9,016 | 8,597 | 15,722 | 13,872
Western | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 332 | 341 | 571 | 782
Western | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,454 | 3,287 | 6,124 | 5,852
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 720 | 517 | 1,361 | 1,324
Resource Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,145 | 44,635 | 95,706 | 87,151
Resource Solutions | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8,231 | 6,505 | 12,692 | 12,896
Resource Solutions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 39,914 | 38,130 | 83,014 | 74,255
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 | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,239 | 19,216 | 41,902 | 37,370
Resource Solutions | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12,487 | 10,514 | 23,453 | 21,280
Resource Solutions | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 15,419 | 14,905 | 30,351 | 28,501
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

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