FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Restricted investment securities - landfill closure	$ 1,953	$ 1,848
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate swaps	0
Total assets	1,953
Liabilities:
Interest rate swaps	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Landfill
Assets:
Restricted investment securities - landfill closure	1,953	1,848
Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	153
Total assets	153
Liabilities:
Interest rate swaps	8,735	13,237
Recurring \| Significant Other Observable Inputs (Level 2) \| Landfill
Assets:
Restricted investment securities - landfill closure	0	0
Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swaps	0
Total assets	0
Liabilities:
Interest rate swaps	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Landfill
Assets:
Restricted investment securities - landfill closure	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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