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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 163,664 | $ 147,455
Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,736 | 8,173
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 156,928 | 139,282
Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 83,562 | 67,007
Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 19,185 | 20,500
Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 14,261 | 13,166
Customer solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 18,154 | 15,170
Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 11,207 | 11,105
Organics |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 13,596 | 12,200
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,563 | 6,508
Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,136 | 1,799
Eastern |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 46,997 | 44,505
Eastern | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 36 | 191
Eastern | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 46,961 | 44,314
Eastern | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 33,965 | 30,523
Eastern | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,717 | 5,960
Eastern | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 8,986 | 7,560
Eastern | Customer solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eastern | Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eastern | Organics |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eastern | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eastern | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 329 | 462
Western |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 73,634 | 64,739
Western | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 309 | 368
Western | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 73,325 | 64,371
Western | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 49,597 | 36,484
Western | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 15,468 | 14,540
Western | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 5,275 | 5,606
Western | Customer solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Western | Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 441 | 948
Western | Organics |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Western | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,046 | 5,824
Western | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 807 | 1,337
Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 10,766 | 10,157
Recycling | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,124 | 7,257
Recycling | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,642 | 2,900
Recycling | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Recycling | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Recycling | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Recycling | Customer solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Recycling | Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 10,766 | 10,157
Recycling | Organics |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Recycling | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Recycling | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 32,267 | 28,054
Other | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 267 | 357
Other | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 32,000 | 27,697
Other | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other | Customer solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 18,154 | 15,170
Other | Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other | Organics |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 13,596 | 12,200
Other | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 517 | 684
Other | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 0 | $ 0

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