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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Property, Plant and Equipment [Abstract] |  |
Asset retirement costs | $ 24.0 | $ 20.7

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- Definition The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration