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Goodwill and Other Intangibles - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Amortization of Intangible Assets $ 400,000us-gaap_AmortizationOfIntangibleAssets $ 400,000us-gaap_AmortizationOfIntangibleAssets
2015 800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 1,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 1,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 1,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 1,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Remaining amortization period 21 years 2 months 12 days  
Indications of impairment of goodwill $ 0us-gaap_GoodwillImpairmentLoss  
Patents [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Remaining amortization period 10 years 9 months 18 days  
Land Use Rights [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Remaining amortization period 59 years 10 months 24 days  
Trademark [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Remaining amortization period 10 years 4 months 24 days  
Technology [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Remaining amortization period 16 years 7 months 6 days  
Customer Relationships [Member]    
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]    
Remaining amortization period 14 years 9 months 18 days