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Goodwill - Summary of Weighted Average Cost of Capital (Detail) - US Dollar [member]
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Colombia [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital   6.00%
Colombia [member] | Top of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 7.00%  
Colombia [member] | Bottom of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 6.00%  
Rest of Middle Americas [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital   9.00%
Rest of Middle Americas [member] | Top of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 11.00%  
Rest of Middle Americas [member] | Bottom of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 10.00%  
South Africa [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital   7.00%
South Africa [member] | Top of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 8.00%  
South Africa [member] | Bottom of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 7.00%  
Rest of Africa [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital   10.00%
Rest of Africa [member] | Top of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 12.00%  
Rest of Africa [member] | Bottom of range [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 10.00%  
Rest Of Asia Pacific [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Weighted average cost of capital 8.00%