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Segmental information - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Segment Region
Disclosure of reportable segments [line items] |
Number of geographical regions | Region | 4
Number of reportable segments | Segment | 5
Geographic concentration risk2 [member] | Revenue [member] |
Disclosure of reportable segments [line items] |
Concentration risk benchmark | Revenue relating to an individual country is separately disclosed when it represents 10% or more of total revenue.
Concentration risk percentage | 10.00%
Geographic concentration risk2 [member] | Non-current Assets [member] |
Disclosure of reportable segments [line items] |
Concentration risk benchmark | Non-current assets relating to an individual country are separately disclosed when they represent 10% or more of total non-current
Concentration risk percentage | 10.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Number of geographical regions. + References No definition available. + Details
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- Details
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- Details
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- Details
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