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Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Land $ 25,982us-gaap_Land $ 26,398us-gaap_Land
Buildings and building improvements 115,856us-gaap_BuildingsAndImprovementsGross 112,208us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 210,488us-gaap_MachineryAndEquipmentGross 200,567us-gaap_MachineryAndEquipmentGross
Construction in progress 10,518us-gaap_ConstructionInProgressGross 9,543us-gaap_ConstructionInProgressGross
Property, Plant and Equipment, Gross 362,844us-gaap_PropertyPlantAndEquipmentGross 348,716us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation (219,952)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (206,634)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, Plant and Equipment, Net $ 142,892us-gaap_PropertyPlantAndEquipmentNet $ 142,082us-gaap_PropertyPlantAndEquipmentNet