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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]        
Amortization of Intangible Assets $ 300,000 $ 400,000 $ 600,000 $ 800,000
2015 500,000   500,000  
2016 1,100,000   1,100,000  
2017 1,000,000   1,000,000  
2018 1,000,000   1,000,000  
2019 $ 1,000,000   1,000,000  
Remaining amortization period 21 years 2 months 12 days      
Indications of impairment of goodwill     $ 0  
Patents [Member]        
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]        
Remaining amortization period 10 years 6 months      
Land Use Rights [Member]        
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]        
Remaining amortization period 60 years      
Trademark [Member]        
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]        
Remaining amortization period 10 years 3 months 18 days      
Technology [Member]        
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]        
Remaining amortization period 16 years 4 months 24 days      
Customer Relationships [Member]        
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]        
Remaining amortization period 14 years 8 months 12 days