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COMMITMENTS AND CONTINGENCIES - Narrative (Detail)
numberOfPlantiffs in Thousands
 12 Months Ended
Sep. 17, 2019
numberOfPlantiffs
Apr. 28, 2017
USD ($)
Dec. 31, 2019
USD ($)
executive_officer
Jan. 31, 2020
USD ($)
Apr. 26, 2017
USD ($)
Jan. 29, 2016
Apr. 30, 2011
USD ($)
May 31, 2009
USD ($)
Dec. 20, 2000
a
Other Commitments [Line Items]                  
Contract extension period     1 year            
Number of executive officers | executive_officer     5            
Intangible assets, useful life     10 years            
Total annual commitments for salaries     $ 1,937,000            
New York Class Litigation                  
Other Commitments [Line Items]                  
Number of plaintiffs | numberOfPlantiffs 1                
Notice of Intent to Sue under the Resource Conservation and Recovery Act                  
Other Commitments [Line Items]                  
Estimated possible loss         $ 5,000,000        
Minimum                  
Other Commitments [Line Items]                  
Initial term of employment contract     1 year            
Intangible assets, useful life     5 years            
Salary and bonuses payment range     1 year            
Minimum | Employment Contracts                  
Other Commitments [Line Items]                  
Intangible assets, useful life     1 year            
Maximum                  
Other Commitments [Line Items]                  
Initial term of employment contract     3 years            
Intangible assets, useful life     10 years            
Salary and bonuses payment range     3 years            
Maximum | Employment Contracts                  
Other Commitments [Line Items]                  
Intangible assets, useful life     2 years            
Southbridge Landfill                  
Other Commitments [Line Items]                  
Risk free interest rate     1.90%            
Potsdam Environmental Remediation Liability                  
Other Commitments [Line Items]                  
Risk free interest rate     1.50%            
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%      
NCES Landfil | Notice of Intent to Sue for Violations of the CWA | Subsequent Event                  
Other Commitments [Line Items]                  
Estimated possible loss       $ 1,195,000          
MADEP | Notice of Intent to Sue under the Resource Conservation and Recovery Act                  
Other Commitments [Line Items]                  
Estimated possible loss         $ 10,000,000        
21E Settlement and Water System Construction Funding Agreement | Bonds                  
Other Commitments [Line Items]                  
Facility term   20 years              
21E Settlement and Water System Construction Funding Agreement | Bonds | Maximum                  
Other Commitments [Line Items]                  
Anticipated costs   $ 5,000,000