Quarterly report pursuant to Section 13 or 15(d)

Impairment of Long-Lived Assets - Additional Information (Detail)

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Impairment of Long-Lived Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Impaired Long-Lived Assets Held and Used [Line Items]  
Impairment charges of assets held for sale, land $ 5.6