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DIVESTITURE TRANSACTIONS AND DISCONTINUED OPERATIONS - Narrative (Detail) - USD ($) | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal of discontinued operations, net |  | $ 0 | $ 0 | $ 0 | $ (378,000) |
Divestiture transactions |  | (553,000) | 0 | (5,517,000) | 7,455,000 |
Remaining divestiture costs |  |  | 14,916,000 | 17,765,000 |  |
Proceeds from sale of assets |  | $ 0 | 0 | 5,335,000 | 0 |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal of discontinued operations, net |  |  |  |  | $ (378,000) |
Casella-Altela Regional Environmental Services, LLC | Disposal Group, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Membership interest |  | 51.00% |  |  |  |
Casella-Altela Regional Environmental Services, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal |  |  |  | 2,850,000 |  |
Proceeds from sale of assets |  |  |  | $ 3,500,000 |  |
Altela, Inc. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Membership interest |  |  |  | 49.00% |  |
Maine Energy Facility | Disposal Group, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Undiscounted purchase consideration |  |  |  |  |  | $ 6,650,000
Undiscounted purchase consideration paid in installments |  |  |  |  |  | 21 years
Divestiture transactions |  |  |  | $ 1,149,000 |  |
Remaining divestiture costs |  |  | $ 0 |  |  |
BioFuels Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Undiscounted purchase consideration | $ 2,000,000 |  |  |  |  |
Undiscounted purchase consideration paid in installments | 5 years |  |  |  |  |
BioFuels | Disposal Group, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal |  | $ 553,000 |  |  |  |
Western | Disposal Group, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration received from sale of assets |  |  |  | 872,000 |  |
Gain (loss) on disposal |  |  |  | 590,000 |  |
Western | Cares | Disposal Group, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment charge |  | $ 7,455,000 |  |  |  |
Equipment and Real Estate | Casella-Altela Regional Environmental Services, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal |  |  |  | 928,000 |  |
Proceeds from sale of assets |  |  |  | $ 1,050,000 |  |

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