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Divestiture Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Apr. 30, 2013 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain on divestiture | $ (677) |  | $ 7,455 | $ (5,611) | $ 7,455 |  |
Other accrued liabilities | 16,629 |  |  | 16,629 |  |  | $ 16,667
Proceeds from sale of assets |  |  |  | $ 5,335 |  |  |
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 |  |  |  |  |  |
Gain on divestiture | $ (677) |  |  |  |  |  |
Western Region [Member] | Cares [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Impairment charge |  |  | $ 7,455 |  | $ 7,455 |  |
Casella-Altela Regional Environmental Services, LLC [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain on divestiture |  | $ (2,850) |  |  |  |  |
Membership interest | 51.00% |  |  | 51.00% |  |  |
Proceeds from sale of assets |  | 3,500 |  |  |  |  |
Casella-Altela Regional Environmental Services, LLC [Member] | Other Assets [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain on divestiture |  | (928) |  |  |  |  |
Proceeds from sale of assets |  | $ 1,050 |  |  |  |  |
Casella-Altela Regional Environmental Services, LLC [Member] | 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] |  |  |  |  |  |  |
Gain on divestiture |  | $ (1,157) |  |  |  |  |
Undiscounted purchase consideration |  |  |  |  |  | $ 6,650 |
Undiscounted purchase consideration paid in installments |  |  |  |  |  | 21 years |
Other accrued liabilities | $ 96 |  |  | $ 96 |  |  |

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