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Product Warranties - Product Warranty Activities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Guarantees [Abstract]    
Beginning of period $ 6,266us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 6,956us-gaap_ProductWarrantyAccrualClassifiedCurrent
Provision for product warranties 1,109us-gaap_ProductWarrantyExpense 704us-gaap_ProductWarrantyExpense
Direct charges to warranty liability (1,244)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease (656)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Foreign currency translation (67)us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease 9us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
End of period $ 6,064us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 7,013us-gaap_ProductWarrantyAccrualClassifiedCurrent