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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 202,667 | $ 198,547 | $ 574,344 | $ 549,670
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8,135 | 5,970 | 21,554 | 19,441
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 194,532 | 192,577 | 552,790 | 530,229
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 104,171 | 101,191 | 295,282 | 278,433
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,574 | 25,432 | 63,216 | 68,899
Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 21,617 | 21,941 | 58,173 | 56,723
Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,320 | 20,689 | 64,223 | 58,058
Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 13,111 | 11,191 | 37,157 | 33,254
Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,539 | 14,166 | 44,890 | 42,668
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,348 | 3,129 | 8,472 | 8,980
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 987 | 808 | 2,931 | 2,655
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 58,323 | 59,675 | 161,803 | 163,748
Eastern | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 52 | 36 | 177 | 123
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 58,271 | 59,639 | 161,626 | 163,625
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 40,560 | 41,868 | 114,504 | 115,363
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,694 | 5,414 | 13,807 | 14,558
Eastern | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,861 | 12,247 | 32,695 | 33,157
Eastern | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (2) | 4 | 4 | 5
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 | 210 | 142 | 793 | 665
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 94,728 | 93,291 | 267,218 | 253,190
Western | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 347 | 186 | 949 | 673
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 94,381 | 93,105 | 266,269 | 252,517
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 63,611 | 59,323 | 180,778 | 163,070
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17,880 | 20,018 | 49,409 | 54,341
Western | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9,756 | 9,694 | 25,478 | 23,566
Western | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 356 | 461 | 943 | 1,243
Western | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,348 | 3,129 | 8,472 | 8,980
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 777 | 666 | 2,138 | 1,990
Resource Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 49,616 | 45,581 | 145,323 | 132,732
Resource Solutions | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,736 | 5,748 | 20,428 | 18,645
Resource Solutions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 41,880 | 39,833 | 124,895 | 114,087
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 | 22,320 | 20,689 | 64,223 | 58,058
Resource Solutions | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12,757 | 10,726 | 36,210 | 32,006
Resource Solutions | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,539 | 14,166 | 44,890 | 42,668
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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