Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Indefinite-lived Intangible Assets [Line Items]  
The estimated aggregate fair value of the long-lived assets $ 3,876