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Plant and Equipment Expected Useful Lives and Estimated Residual Values (Detail)
6 Months Ended
Jun. 30, 2013
Building
 
Property, Plant and Equipment [Line Items]  
Property plant and equipment, useful life 30 years
Property plant and equipment, residual value 5.00%
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