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RELATED PARTY TRANSACTIONS (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 30, 1994 lease
Related Party Transaction [Line Items] |  |  |  |
Total services purchased | $ 13,046 | $ 7,574 | $ 3,442 |
Outstanding accounts payable | 1,297 | 851 |  |
Number of leases | lease |  |  |  | 2
Amortization of right-of-use assets | 3,736 | 2,122 |  |
Accrued costs associated with post-closure obligations | 82,533 | 71,927 | 73,075 |
Landfills |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Landfill post-closure cost | 8 | 9 | 14 |
Accrued costs associated with post-closure obligations | 25 | 37 |  |
CCI |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related party | 288 | 132 | 156 |
Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Leases monthly payments | 29 |  |  |
Amortization of right-of-use assets | $ 319 | $ 339 |  |
Total expense charged to operations under lease agreement |  |  | $ 349 |

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