ASSET RETIREMENT OBLIGATION (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Related asset removal period	55 years
Asset Retirement Obligation, Roll Forward Analysis
Long-term portion of asset retirement obligation	$ 43,981	$ 47,093
Liabilities subject to compromise	(16,480,256)	0
Asset Retirement Obligation Costs
Asset Retirement Obligation, Roll Forward Analysis
Beginning balance	47,984	42,491
Adjustment due to changes in estimates	1,297	2,317
Accretion of liability	3,273	3,555
Liabilities settled	(3,389)	(2,880)
Foreign Currency	(1,394)	2,501
Ending balance	47,771	47,984
Less: current portion	445	891
Long-term portion of asset retirement obligation	47,326	$ 47,093
Liabilities subject to compromise	$ (3,300)

Asset Retirement Obligations, Related Asset Removal Period

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Total amount of liabilities subject to compromise.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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