Straight-line over estimated useful (Detail)	12 Months Ended
	Dec. 31, 2012
Buildings
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	39 years
Research Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	7 years
Maximum | Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	7 years
Maximum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	3 years
Maximum | Computer Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	5 years
Maximum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	5 years
Minimum | Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	5 years
Minimum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	1 year
Minimum | Computer Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	3 years
Minimum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	3 years