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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