ENVIRONMENTAL COSTS (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Environmental Exit Cost [Line Items]
Accrual For Environmental Loss Contingencies	$ 20.5	$ 20.8
Site Contingency, Accrual, Undiscounted Amount	19.9
Accrual For Environmental Loss Contingencies Current Value Of Anticipated Remediation Costs	40.80%
Wood Ridge [Member]
Environmental Exit Cost [Line Items]
Accrual For Environmental Loss Contingencies	7.3
Fairfield [Member]
Environmental Exit Cost [Line Items]
Accrual For Environmental Loss Contingencies	0.6
Caldwell Trucking [Member]
Environmental Exit Cost [Line Items]
Accrual For Environmental Loss Contingencies	4.6
NRC [Member]
Environmental Exit Cost [Line Items]
Accrual For Environmental Loss Contingencies	$ 7.7