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Segment Information - Geographical Area - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Venezuela [member]    
Disclosure of geographical areas [line items]    
Adjustment in respect of price growth in Venezuela 1.30% 0.00%
Price growth prior to Venezuela adjustment 1.50%  
Exchange rate impact prior to Venezuela adjustment (10.10%)  
The Americas [member]    
Disclosure of geographical areas [line items]    
Adjustment in respect of price growth in Venezuela 4.20%