Property And Equipment at Cost Depreciation and Amortization Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2012
Land improvements | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	8 years
Land improvements | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Buildings and improvements | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	8 years
Buildings and improvements | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Machinery, equipment and other | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Machinery, equipment and other | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Office and transportation equipment | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Office and transportation equipment | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	10 years