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DIVESTITURE TRANSACTIONS - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 30, 2013
Dec. 31, 2015
Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Divestiture transactions $ 0 $ 0   $ 0 $ (5,611,000)      
Remaining divestiture costs $ 16,830,000     16,830,000     $ 17,765,000  
Proceeds from sale of assets       $ 0 5,335,000      
Western Region                
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                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Divestiture transactions         (2,850,000)      
Membership interest 51.00%     51.00%        
Proceeds from sale of assets         3,500,000      
Casella-Altela Regional Environmental Services, LLC | Discontinued Operations, Disposed of by Sale                
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.                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Membership interest               49.00%
Maine Energy Facility                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Divestiture transactions         $ 1,157,000      
Undiscounted purchase consideration           $ 6,650,000    
Undiscounted purchase consideration paid in installments           21 years    
Remaining divestiture costs $ 0     $ 0