XML 154 R109.htm IDEA: XBRL DOCUMENT v3.10.0.1
Property, plant and equipment - Useful lives of property, plant and equipment (Detail)
 12 Months Ended
Dec. 31, 2018
Buildings [member]  
Property, plant and equipment - Property, plant and equipment (Detail) [Line Items]  
Useful lives or depreciation rates, property, plant and equipment from 5 to 50 years
Machinery [member]  
Property, plant and equipment - Property, plant and equipment (Detail) [Line Items]  
Useful lives or depreciation rates, property, plant and equipment from 3 to 20 years
Other equipment [Member]  
Property, plant and equipment - Property, plant and equipment (Detail) [Line Items]  
Useful lives or depreciation rates, property, plant and equipment from 1 to 10 years