Plant and Equipment Expected Useful Lives and Estimated Residual Values (Detail)	6 Months Ended
	Jun. 30, 2014
Building
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	30 years
Plant and machinery | Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	10 years
Plant and machinery | Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	20 years
Furniture, fixture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	5 years
Furniture, fixture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	8 years