Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2012
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life in year	5 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life in year	50 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life in year	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life in year	30 years
Containers | Minimum
Property, Plant and Equipment [Line Items]
Useful life in year	2 years
Containers | Maximum
Property, Plant and Equipment [Line Items]
Useful life in year	20 years
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Useful life in year	3 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Useful life in year	7 years
Office equipment and furniture | Minimum
Property, Plant and Equipment [Line Items]
Useful life in year	2 years
Office equipment and furniture | Maximum
Property, Plant and Equipment [Line Items]
Useful life in year	15 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Useful life in year	2 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Useful life in year	7 years