CONTINGENCIES AND COMMITMENTS (Detail) (USD $)								9 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Environmental Matters [Member]	Dec. 31, 2012 Environmental Matters [Member]	Sep. 30, 2013 Standby Letters Of Credit [Member]	Dec. 31, 2012 Standby Letters Of Credit [Member]	Sep. 30, 2013 FinancialStandbyLetterOfCreditMember	Dec. 31, 2012 FinancialStandbyLetterOfCreditMember	Sep. 30, 2013 PENNSYLVANIA	Jun. 03, 2013 PENNSYLVANIA building acre sqft	Sep. 30, 2013 IDAHO	Jun. 05, 2013 IDAHO building sqft acre	Oct. 10, 2013 Subsequent Event [Member]	Oct. 10, 2013 Subsequent Event [Member] Failure to Meet Contractual Obligations [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 16,800,000	$ 16,400,000
Letters of credit, outstanding				51,100,000	51,800,000	18,300,000	6,800,000
Surety Bond Outstanding	52,900,000
Damages sought													25,000,000
Range of possible loss, minimum												0
Range of possible loss, maximum												25,000,000
Number of buildings									2		2
Area of real estate property									178,975		112,000
Area of land									12.5		8.6
Future minimum operating expenses								$ 1,900,000		$ 1,100,000
Annual rent escalation								2.50%		2.50%
Term of operating lease								15 years		15 years