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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