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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Restricted investment securities - landfill closure $ 1,619 $ 1,586
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Liabilities:    
Interest rate swaps 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Landfill    
Assets:    
Restricted investment securities - landfill closure 1,619 1,586
Recurring | Significant Other Observable Inputs (Level 2)    
Liabilities:    
Interest rate swaps 14,440 5,427
Recurring | Significant Other Observable Inputs (Level 2) | Landfill    
Assets:    
Restricted investment securities - landfill closure 0 0
Recurring | Significant Unobservable Inputs (Level 3)    
Liabilities:    
Interest rate swaps 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Landfill    
Assets:    
Restricted investment securities - landfill closure $ 0 $ 0