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Commitments and Contingencies - Range of Environmental Liability and Number of Active Sites for Environmental Matters (Detail) (Environmental Related Matters [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012 site	Dec. 31, 2011 site
Environmental Related Matters [Member]
Environmental Matters Range Of Estimated Liability And Active Sites Numbers [Line Items]
Low-end range	$ 76.9	$ 81.3
High end range	$ 167.1	$ 175.0
Number of active environmental investigation and remediation sites	58	64

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The estimated maximum amount of possible loss from the contingency.

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