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Commitments and Contingencies - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
a
Dec. 31, 2015
USD ($)
Feb. 29, 2016
Resident
Jan. 29, 2016
Apr. 30, 2011
USD ($)
May. 31, 2009
USD ($)
Expera Old Town LLC [Member]            
Contingencies And Commitments [Line Items]            
Reserve related with settlement $ 2,616,000          
Contract settlement charge   $ 1,940,000        
Reserve related with settlement   $ 676,000        
Reserve for legal costs 46,000          
Expera Old Town LLC [Member] | upon execution of SA [Member]            
Contingencies And Commitments [Line Items]            
Litigation settlement 1,250,000          
Expera Old Town LLC [Member] | Five years following execution of SA [Member]            
Contingencies And Commitments [Line Items]            
Litigation settlement 350,000          
Southbridge Recycling and Disposal Park, Inc [Member]            
Contingencies And Commitments [Line Items]            
Number of resident's homes representing legal suit | Resident     40      
Maximum [Member] | Expera Old Town LLC [Member]            
Contingencies And Commitments [Line Items]            
Fuel replacement fee $ 2,000,000          
Potsdam Environmental Remediation Liability [Member]            
Contingencies And Commitments [Line Items]            
Scrap yard and solid waste transfer station | 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 1.80%