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SEGMENT REPORTING - Summary of Revenue Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 174,724 | $ 172,832 | $ 165,649 | $ 147,455 | $ 151,222 | $ 160,269 | $ 154,016 | $ 133,802 | $ 660,660 | $ 599,309 | $ 565,030
Revenues percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Collection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 303,418 | $ 263,688 | $ 249,640
Revenues percentage |  |  |  |  |  |  |  |  | 45.90% | 44.00% | 44.20%
Disposal |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 181,110 | $ 160,073 | $ 154,211
Revenues percentage |  |  |  |  |  |  |  |  | 27.40% | 26.70% | 27.30%
Power generation |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 5,129 | $ 5,375 | $ 5,921
Revenues percentage |  |  |  |  |  |  |  |  | 0.80% | 0.90% | 1.00%
Processing |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 7,174 | $ 7,994 | $ 6,282
Revenues percentage |  |  |  |  |  |  |  |  | 1.10% | 1.30% | 1.10%
Solid waste operations |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 496,831 | $ 437,130 | $ 416,054
Revenues percentage |  |  |  |  |  |  |  |  | 75.20% | 72.90% | 73.60%
Organics |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 54,174 | $ 39,815 | $ 41,587
Revenues percentage |  |  |  |  |  |  |  |  | 8.20% | 6.60% | 7.40%
Customer solutions |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 67,464 | $ 60,057 | $ 54,478
Revenues percentage |  |  |  |  |  |  |  |  | 10.20% | 10.10% | 9.60%
Recycling |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 42,191 | $ 62,307 | $ 52,911
Revenues percentage |  |  |  |  |  |  |  |  | 6.40% | 10.40% | 9.40%

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