FAIR VALUE OF FINANCIAL INSTRUMENTS (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Restricted assets - landfill closure	$ 1,220	$ 1,002
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring
Assets:
Restricted assets - landfill closure		1,002
Interest rate swaps	0
Total asset fair value	1,220
Liabilities:
Interest rate swaps	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Restricted assets - landfill closure
Assets:
Restricted assets - landfill closure	1,220
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring
Assets:
Restricted assets - landfill closure		0
Interest rate swaps	401
Total asset fair value	401
Liabilities:
Interest rate swaps	123
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Restricted assets - landfill closure
Assets:
Restricted assets - landfill closure	0
Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring
Assets:
Restricted assets - landfill closure		$ 0
Interest rate swaps	0
Total asset fair value	0
Liabilities:
Interest rate swaps	0
Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring \| Restricted assets - landfill closure
Assets:
Restricted assets - landfill closure	$ 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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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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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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