Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Land	$ 16,795	$ 15,903
Buildings and improvements	174,615	155,769
Manufacturing equipment	274,723	248,201
Canisters and cylinders	77,325	65,100
Molds	80,198	76,782
Office furniture and equipment	121,345	107,194
Construction in progress	42,288	40,136
Property, plant and equipment, gross	787,289	709,085
Less accumulated depreciation	427,766	387,523
Property, plant and equipment, net	$ 359,523	$ 321,562	$ 321,301
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