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ENVIRONMENTAL COSTS (Detail) (USD $)	12 Months Ended
ENVIRONMENTAL COSTS (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EnvironmentalExitCostLineItems
Accrual For Environmental Loss Contingencies	$ 16,400,000	$ 20,500,000
SiteContingencyAccrualUndiscountedAmount	19,700,000
Accrual For Environmental Loss Contingencies Current Value Of Anticipated Remediation Costs	25.90%
IncreaseDecreaseInAssetRetirementObligations	6,904,000	0	0
Wood Ridge [Member]
EnvironmentalExitCostLineItems
Accrual For Environmental Loss Contingencies	7,300,000
Caldwell Trucking [Member]
EnvironmentalExitCostLineItems
Accrual For Environmental Loss Contingencies	4,600,000
EMD [Member]
EnvironmentalExitCostLineItems
IncreaseDecreaseInAssetRetirementObligations	6,000,000
AccretionExpenseIncludingAssetRetirementObligations	1,000,000
AssetRetirementObligation	$ 9,000,000

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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- Definition

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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