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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 172,832 | $ 485,936
Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 8,935 | 24,877
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 163,897 | 461,059
Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 80,844 | 223,348
Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 27,100 | 71,683
Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 18,291 | 50,212
Customer solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 17,195 | 48,315
Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 11,757 | 33,904
Organics |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 13,413 | 40,259
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,312 | 14,200
Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 920 | 4,015
Eastern |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 56,006 | 154,099
Eastern | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 128 | 500
Eastern | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 55,878 | 153,599
Eastern | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 36,392 | 101,544
Eastern | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 8,336 | 22,179
Eastern | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 11,001 | 29,305
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 | 5 | 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 | 272 | 1,071
Western |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 74,425 | 210,208
Western | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 233 | 847
Western | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 74,192 | 209,361
Western | Collection |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 44,452 | 121,804
Western | Landfill |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 18,764 | 49,504
Western | Transfer |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,290 | 20,907
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 | 875 | 3,270
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 | 2,396 | 11,779
Western | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 648 | 2,944
Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 10,877 | 30,634
Recycling | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,436 | 20,311
Recycling | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,441 | 10,323
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 | 10,877 | 30,634
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 | 31,524 | 90,995
Other | Transferred at a point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,138 | 3,219
Other | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 30,386 | 87,776
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 | 17,195 | 48,315
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 | 13,413 | 40,259
Other | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 916 | 2,421
Other | Landfill gas-to-energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 0 | $ 0

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