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COMMITMENTS AND CONTINGENCIES - Narrative (Detail)
 8 Months Ended 12 Months Ended
Apr. 12, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
executive_officer
Dec. 31, 2015
USD ($)
Apr. 30, 2014
USD ($)
Jan. 29, 2016
Apr. 30, 2011
USD ($)
May 31, 2009
USD ($)
Dec. 20, 2000
a
Other Commitments [Line Items]                  
Monthly payments (up to)     $ 20,000            
Total rent expense under operating leases charged to operations   $ 4,868,000 $ 11,437,000 $ 9,392,000 $ 5,651,000        
Intangible assets, useful life     10 years            
Contract settlement charge   $ 0 $ 0 1,940,000 $ 0        
Number of executive officers | executive_officer     5            
Contract extension period     1 year            
Total annual commitments for salaries     $ 1,646,000            
Expera Old Town LLC                  
Other Commitments [Line Items]                  
Fuel replacement fee (up to)     2,000,000            
Intangible assets, useful life 5 years                
Reserve related with settlement     1,448,000 2,616,000          
Contract settlement charge       1,940,000          
Southbridge Recycling & Disposal Park, Inc. vs Southbridge, Massachusetts                  
Other Commitments [Line Items]                  
Incurred total costs to date     2,465,000            
Notice of Intent to Sue under the Resource Conservation and Recovery Act                  
Other Commitments [Line Items]                  
Agreement in principle amount (up to)     $ 5,000,000            
Upon execution of SA | Expera Old Town LLC                  
Other Commitments [Line Items]                  
Litigation settlement $ 1,250,000                
Five years following execution of SA | Expera Old Town LLC                  
Other Commitments [Line Items]                  
Litigation settlement $ 350,000                
Operating Expense | Expera Old Town LLC                  
Other Commitments [Line Items]                  
Reserve related with settlement       $ 676,000          
Maximum                  
Other Commitments [Line Items]                  
Intangible assets, useful life     10 years            
Initial term of employment contract     3 years            
Salary and bonuses payment range     3 years            
Maximum | Employment Contracts                  
Other Commitments [Line Items]                  
Intangible assets, useful life     2 years            
Minimum                  
Other Commitments [Line Items]                  
Intangible assets, useful life     5 years            
Initial term of employment contract     1 year            
Salary and bonuses payment range     1 year            
Minimum | Employment Contracts                  
Other Commitments [Line Items]                  
Intangible assets, useful life     1 year            
Potsdam Environmental Remediation Liability                  
Other Commitments [Line Items]                  
Number of acres composing solid waste transfer station (in acres) | a                 25
Estimate of total undiscounted costs associated with implementing the preferred remedies             $ 12,130,000 $ 10,219,000  
Remediation activities, participant share percentage           15.00%      
Risk free interest rate     1.50%            
MADEP | Notice of Intent to Sue under the Resource Conservation and Recovery Act                  
Other Commitments [Line Items]                  
Agreement in principle amount (up to)     $ 5,000,000            
Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems | Notice of Intent to Sue under the Resource Conservation and Recovery Act                  
Other Commitments [Line Items]                  
Agreement in principle amount (up to)     $ 10,000,000