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Divestiture Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2015 | Apr. 30, 2013 | Jun. 30, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture transactions | $ 677,000 |  | $ 5,611,000 |  |  |
Remaining divestiture costs |  |  |  |  | $ 17,121,000 | $ 17,765,000
Proceeds from sale of assets |  |  | $ 5,335,000 |  |  |
Western Region [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration received from sale of assets | 872,000 |  |  |  |  |
Divestiture transactions | $ 677,000 |  |  |  |  |
Casella-Altela Regional Environmental Services, LLC [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture transactions |  | $ 2,850 |  |  |  |
Membership interest |  |  |  |  | 51.00% |
Proceeds from sale of assets |  | 3,500 |  |  |  |
Casella-Altela Regional Environmental Services, LLC [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture transactions |  | 928,000 |  |  |  |
Proceeds from sale of assets |  | $ 1,050,000 |  |  |  |
Altela, Inc. [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Membership interest |  | 49.00% |  |  |  |
Maine Energy Facility [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture transactions |  | $ 1,157 |  |  |  |
Undiscounted purchase consideration |  |  |  | $ 6,650,000 |  |
Undiscounted purchase consideration paid in installments |  |  |  | 21 years |  |
Remaining divestiture costs |  |  |  |  | $ 0 |

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