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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Operable_Unit
Commitments And Contingencies Disclosure [Abstract]  
Aggregate of response actions response costs and NRDs $ 1,000,000,000
Number of operable units 5
Cost of response incurred by government 4,280,000
Reasonable outside estimate for cost of remediation made by government to all parties 1,500,000,000
Estimated future cost of work yet to be done 360,000,000
Annual estimated cost rate seeks by government 70,000,000
Initial minimum amount of NRD assessment 176,000,000
Initial maximum amount of NRD assessment 333,000,000
Revised minimum amount of NRD assessment 287,000,000
Revised maximum amount of NRD assessment 423,000,000
The limitation period for the NRD's claims 3 years
Reserve for environmental liability, current portion 100,000
Reserve for claiming liability 16,300,000
Maximum estimated percentage of discharge 27.00%
Maximum estimated cost related to Fox River matter $ 275,000,000
Period over which estimated cost accrued 10 years