Depreciation and Amortization, Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2011 Year
Land improvements
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment, minimum	10
Useful life of property, plant and equipment, maximum	20
Buildings
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment	40
Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment, minimum	3
Useful life of property, plant and equipment, maximum	15
Computer software
Property, Plant and Equipment [Line Items]
Useful life of finite lived intangible asset, minimum	3
Useful life of finite lived intangible assets, maximum	5