Estimated Useful lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2011 Year
Land Improvements
Property, Plant and Equipment [Line Items]
Estimated Useful lives	5
Estimated Useful lives	20
Buildings and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Estimated Useful lives	5
Estimated Useful lives	50
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Estimated Useful lives	3
Estimated Useful lives	15