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Property, Plant and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2011
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| Property Plant And Equipment [Abstract] | |
| Interest expense | $ 4.2 |
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- Definition
Amount of interest capitalized, including amount of allowance for funds used during construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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