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 Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2012
Property Plant And Equipment [Abstract]    
Impairment charges of assets held for sale, land $ 5,600 $ 5,608