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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | $ 660,660 | $ 599,309 | $ 565,030
Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 206,473 |  |
Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 286,262 |  |
Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 42,191 |  |
Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 125,734 |  |
Collection |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 306,939 |  |
Collection | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 136,661 |  |
Collection | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 170,278 |  |
Collection | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Collection | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Landfill |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 94,986 |  |
Landfill | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 28,419 |  |
Landfill | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 66,567 |  |
Landfill | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Landfill | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Transfer |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 67,583 |  |
Transfer | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 39,991 |  |
Transfer | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 27,592 |  |
Transfer | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Transfer | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Customer solutions |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 67,464 |  |
Customer solutions | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Customer solutions | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Customer solutions | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Customer solutions | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 67,464 |  |
Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 46,019 |  |
Recycling | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 5 |  |
Recycling | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 3,823 |  |
Recycling | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 42,191 |  |
Recycling | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Organics |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 54,174 |  |
Organics | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Organics | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Organics | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Organics | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 54,174 |  |
Transportation |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 18,366 |  |
Transportation | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Transportation | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 14,270 |  |
Transportation | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Transportation | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 4,096 |  |
Landfill gas-to-energy |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 5,129 |  |
Landfill gas-to-energy | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 1,397 |  |
Landfill gas-to-energy | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 3,732 |  |
Landfill gas-to-energy | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Landfill gas-to-energy | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 0 |  |
Transferred at a point-in-time |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 32,974 |  |
Transferred at a point-in-time | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 648 |  |
Transferred at a point-in-time | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 1,145 |  |
Transferred at a point-in-time | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 27,260 |  |
Transferred at a point-in-time | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 3,921 |  |
Transferred over time |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 627,686 |  |
Transferred over time | Eastern |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 205,825 |  |
Transferred over time | Western |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 285,117 |  |
Transferred over time | Recycling |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | 14,931 |  |
Transferred over time | Other |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total revenues | $ 121,813 |  |

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