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Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Land 15,064us-gaap_Land $ 12,866us-gaap_Land  
Buildings and improvements 150,450us-gaap_BuildingsAndImprovementsGross 109,105us-gaap_BuildingsAndImprovementsGross  
Manufacturing equipment 214,509us-gaap_MachineryAndEquipmentGross 168,197us-gaap_MachineryAndEquipmentGross  
Canisters and cylinders 42,154entg_Canistersandcylinders 0entg_Canistersandcylinders  
Molds 80,532entg_Molds 76,909entg_Molds  
Office furniture and equipment 99,624us-gaap_FurnitureAndFixturesGross 70,158us-gaap_FurnitureAndFixturesGross  
Construction in progress 27,185us-gaap_ConstructionInProgressGross 33,021us-gaap_ConstructionInProgressGross  
Property, plant and equipment, gross 629,518us-gaap_PropertyPlantAndEquipmentGross 470,256us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation 315,949us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 283,816us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, plant and equipment, net 313,569us-gaap_PropertyPlantAndEquipmentNet $ 186,440us-gaap_PropertyPlantAndEquipmentNet $ 157,021us-gaap_PropertyPlantAndEquipmentNet
Minimum | Building and Building Improvements      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 5 years    
Minimum | Manufacturing Equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 5 years    
Minimum | Canisters and cylinders      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 3 years    
Minimum | Molds      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 3 years    
Minimum | Office Furniture and Equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 3 years    
Maximum | Building and Building Improvements      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 35 years    
Maximum | Manufacturing Equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 10 years    
Maximum | Canisters and cylinders      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 12 years    
Maximum | Molds      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 5 years    
Maximum | Office Furniture and Equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives in years 8 years