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OTHER ITEMS AND CHARGES - Charges Associated with Closure of Southbridge Landfill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Site Contingency [Line Items]      
Landfill closure project charge $ 263 $ 74 $ 16,179
Contract settlement charge     2,100
Southbridge Landfill closure charge, net 4,587 2,709 8,054
Southbridge Landfill      
Site Contingency [Line Items]      
Legal and transaction costs 2,285 2,709 2,102
Legal settlement charge 2,000 0 1,216
Landfill closure project charge 490 0 6,012
Environmental remediation charge (188) 0 0
Contract settlement charge 0 0 8,724
Recovery on insurance settlement 0 0 (10,000)
Southbridge Landfill closure charge, net $ 4,587 $ 2,709 $ 8,054