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 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]          
Amortization expenses of intangible assets $ 402 $ 361 $ 754 $ 723 $ 1,447