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CONTINGENCIES AND COMMITMENTS (Detail) (USD $)
 9 Months Ended 0 Months Ended
Sep. 30, 2014
Oct. 10, 2013
Failure to Meet Contractual Obligations [Member]
Sep. 30, 2014
Environmental Matters [Member]
Dec. 31, 2013
Environmental Matters [Member]
Sep. 30, 2014
Standby Letters Of Credit [Member]
Dec. 31, 2013
Standby Letters Of Credit [Member]
Sep. 30, 2014
FinancialStandbyLetterOfCreditMember
Dec. 31, 2013
FinancialStandbyLetterOfCreditMember
Loss Contingencies [Line Items]                
Accrual for environmental loss contingencies     $ 16,000,000 $ 16,300,000        
Letters of credit, outstanding         40,400,000 47,200,000 18,200,000 23,200,000
Surety Bond Outstanding 52,900,000              
Damages sought 1,000,000,000 25,000,000            
Range of possible loss, minimum 0              
Range of possible loss, maximum $ 40,000,000