XML 88 R81.htm IDEA: XBRL DOCUMENT v3.8.0.1
Basis of Preparation and Accounting Policies - Estimated Useful Life of Assets (Detail)
 12 Months Ended
Dec. 31, 2017
Freehold buildings [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 50 years
Leasehold land, buildings and improvements [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment Shorter of 15 to 50 years or lease term
Bottom of range [Member] | Plant and machinery [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 3 years
Bottom of range [Member] | Office furniture, fittings and equipment [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 3 years
Bottom of range [Member] | Motor and transport vehicles [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 3.5 years
Top of range [Member] | Plant and machinery [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 20 years
Top of range [Member] | Office furniture, fittings and equipment [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 20 years
Top of range [Member] | Motor and transport vehicles [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of Property, plant and equipment 15 years