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Plant, Property and Equipment, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Recognized depreciation expense $ 13.8 $ 14.2 $ 40.2 $ 42.2