Property, Plant and Equipment Expected Useful Lives and Estimated Residual Values (Detail)	12 Months Ended
	Dec. 31, 2017
Building
Property, Plant and Equipment [Line Items]
Property plant and equipment, residual value	5.00%
Building | Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	30 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	50 years
Plant and machinery
Property, Plant and Equipment [Line Items]
Property plant and equipment, residual value	5.00%
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
Property, Plant and Equipment [Line Items]
Property plant and equipment, residual value	5.00%
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