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COMMITMENTS AND CONTINGENCIES - Narrative (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 28, 2017
USD ($)
Nov. 30, 2016
basin
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
executive_officer
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 26, 2017
USD ($)
Jan. 29, 2016
Apr. 30, 2011
USD ($)
May 31, 2009
USD ($)
Dec. 20, 2000
a
Other Commitments [Line Items]                      
Monthly payments (up to)       $ 23,000              
Total rent expense under operating leases charged to operations       10,571,000 $ 12,242,000 $ 11,437,000          
Number of storm water basins | basin   2                  
Payments for litigation settlement       $ 850,000              
Ancillary services period       5 years              
Litigation settlement, total cash and services       $ 1,200,000              
Number of executive officers | executive_officer       5              
Intangible assets, useful life       10 years              
Contract extension period       1 year              
Total annual commitments for salaries       $ 1,821,000              
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        
Steadfast Insurance Company                      
Other Commitments [Line Items]                      
Litigation settlement, amount awarded form other party     $ 10,000,000                
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 (as a percent)       2.60%              
Litigation settlement, total cash and services       $ 1,216,000 0            
Reserve for probable loss       226,000              
Litigation settlement, amount awarded form other party       10,000,000 $ 0            
Loss on contract termination       $ 8,724,000              
Potsdam Environmental Remediation Liability                      
Other Commitments [Line Items]                      
Risk free interest rate (as a percent)       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%      
MADEP | 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        
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