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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets:    
Restricted investment securities - landfill closure $ 1,229 $ 1,220
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Interest rate swaps 0 0
Total 1,229 1,220
Liabilities:    
Interest rate swaps 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted investment securities - landfill closure    
Assets:    
Restricted investment securities - landfill closure 1,229 1,220
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Interest rate swaps 2,159 401
Total 2,159 401
Liabilities:    
Interest rate swaps 326 123
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Restricted investment securities - landfill closure    
Assets:    
Restricted investment securities - landfill closure 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Interest rate swaps 0  
Total 0 0
Liabilities:    
Interest rate swaps 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Restricted investment securities - landfill closure    
Assets:    
Restricted investment securities - landfill closure $ 0 $ 0