CONTINGENCIES AND COMMITMENTS (Detail) (USD $) In Millions, unless otherwise specified								6 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Environmental Matters [Member]	Dec. 31, 2012 Environmental Matters [Member]	Jun. 30, 2013 Standby Letters Of Credit [Member]	Dec. 31, 2012 Standby Letters Of Credit [Member]	Jun. 30, 2013 FinancialStandbyLetterOfCreditMember	Dec. 31, 2012 FinancialStandbyLetterOfCreditMember	Jun. 30, 2013 PENNSYLVANIA	Jun. 03, 2013 PENNSYLVANIA building sqft acre	Jun. 30, 2013 IDAHO	Jun. 05, 2013 IDAHO building sqft acre
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 16.6	$ 16.4
Letters of credit, outstanding				54.6	51.8	12.5	6.8
Surety bond, outstanding	52.9
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								$ 1.9		$ 1.1
Annual rent escalation								2.50%		2.50%
Term of operating lease								15 years		15 years