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FAIR VALUE OF FINANCIAL INSTRUMENTS (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Restricted investment securities - landfill closure $ 1,848 $ 1,586
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring    
Liabilities:    
Interest rate swaps 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Landfills    
Assets:    
Restricted investment securities - landfill closure 1,848 1,586
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Liabilities:    
Interest rate swaps 13,237 5,427
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Landfills    
Assets:    
Restricted investment securities - landfill closure 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Liabilities:    
Interest rate swaps 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Landfills    
Assets:    
Restricted investment securities - landfill closure $ 0 $ 0