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Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangible amortization expenses $ 749us-gaap_AmortizationOfIntangibleAssets $ 752us-gaap_AmortizationOfIntangibleAssets