XML 60 R49.htm IDEA: XBRL DOCUMENT v3.21.2
COMMITMENTS AND CONTINGENCIES - Narrative (Detail)
plantiff in Thousands, $ in Thousands
Dec. 01, 2020
USD ($)
Sep. 17, 2019
plantiff
Apr. 28, 2017
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 26, 2017
USD ($)
Jan. 29, 2016
Apr. 30, 2011
USD ($)
May 31, 2009
USD ($)
Dec. 20, 2000
a
Southbridge Landfill                        
Loss Contingencies [Line Items]                        
Risk free interest percentage rate       2.60%                
Environmental remediation liability       $ 4,036 $ 4,261 $ 4,205 $ 4,596          
Potsdam Environmental Remediation                        
Loss Contingencies [Line Items]                        
Risk free interest percentage rate       1.90%                
Scrap yard and solid waste transfer station (in acres) | a                       25
Undiscounted costs preferred remedies                   $ 12,130 $ 10,219  
Remediation activities, participant share percentage                 15.00%      
Environmental remediation liability       $ 939 $ 939              
21E Settlement and Water System Construction Funding Agreement | Bonds                        
Loss Contingencies [Line Items]                        
Bond period     20 years                  
21E Settlement and Water System Construction Funding Agreement | Bonds | Maximum                        
Loss Contingencies [Line Items]                        
Anticipated cost     $ 4,089                  
Notice of Intent to Sue under the Resource Conservation and Recovery Act                        
Loss Contingencies [Line Items]                        
Estimate of possible loss               $ 5,000        
Notice of Intent to Sue under the Resource Conservation and Recovery Act | MADEP and Casella Waste Systems                        
Loss Contingencies [Line Items]                        
Estimate of possible loss               $ 10,000        
Ontario County, New York Class Action Litigation                        
Loss Contingencies [Line Items]                        
Estimate of possible loss $ 900                      
Number of citizens seeking damages | plantiff   1                    
Loss contingency, settlement awarded $ 750