Quarterly report pursuant to sections 13 or 15(d)

Intangible Assets - Additional Information (Detail)

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Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Amortization expenses of intangible assets $ 402 $ 362 $ 1,156 $ 1,085 $ 1,447