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Risks Arising from Financial Instruments - Summary of Currency Transactional Risk (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Euro to Mexican Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 25.72 21.17
Volatility of rates 17.18% 8.92%
Euro to Pound Sterling [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 0.91 0.85
Volatility of rates 9.04% 7.35%
Euro to South Korean Won [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 1,345.90 1,297.02
Volatility of rates 10.91% 6.17%
Euro to US Dollar [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 1.12 1.12
Volatility of rates 6.97% 4.69%
Pound Sterling to US Dollar [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 1.23 1.32
Volatility of rates 10.94% 8.08%
US Dollar to Australian Dollar [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate   1.42
Volatility of rates   6.70%
US Dollar to Chinese Yuan [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 7.07 6.96
Volatility of rates 6.10% 4.86%
US Dollar to Colombian Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 3,752.17 3,272.63
Volatility of rates 15.31% 10.31%
US Dollar to Euro [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 0.89 0.89
Volatility of rates 6.97% 4.69%
US Dollar to Mexican Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 22.97 18.85
Volatility of rates 17.06% 8.48%
US Dollar to Nigerian Naira [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 387.09 362.59
Volatility of rates 10.14% 3.31%
US Dollar to Peruvian Nuevo Sol [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 3.51 3.32
Volatility of rates 6.72% 4.50%
US Dollar to South African Rand [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 17.36 14.04
Volatility of rates 15.97% 12.74%
US Dollar to South Korean Won [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 1,201.91 1,154.55
Volatility of rates 13.15% 7.78%
US Dollar to Tanzanian Shilling [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 2,313.52 2,300.14
Volatility of rates 3.69% 4.94%
US Dollar to Zambian Kwacha [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 18.14 14.02
Volatility of rates 21.38% 19.85%
US dollar to Brazilian real [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Closing rate 5.48  
Volatility of rates 18.93%  
Bottom of range [member] | Euro to Mexican Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 21.30 19.28
Bottom of range [member] | Euro to Pound Sterling [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 0.83 0.79
Bottom of range [member] | Euro to South Korean Won [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1,199.03 1,216.94
Bottom of range [member] | Euro to US Dollar [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1.04 1.07
Bottom of range [member] | Pound Sterling to US Dollar [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1.09 1.21
Bottom of range [member] | US Dollar to Australian Dollar [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate   1.33
Bottom of range [member] | US Dollar to Chinese Yuan [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 6.64 6.62
Bottom of range [member] | US Dollar to Colombian Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 3,177.73 2,935.33
Bottom of range [member] | US Dollar to Euro [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 0.83 0.85
Bottom of range [member] | US Dollar to Mexican Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 19.05 17.25
Bottom of range [member] | US Dollar to Nigerian Naira [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 347.85 350.58
Bottom of range [member] | US Dollar to Peruvian Nuevo Sol [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 3.28 3.17
Bottom of range [member] | US Dollar to South African Rand [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 14.59 12.26
Bottom of range [member] | US Dollar to South Korean Won [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1,043.87 1,064.67
Bottom of range [member] | US Dollar to Tanzanian Shilling [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 2,228.23 2,186.57
Bottom of range [member] | US Dollar to Zambian Kwacha [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 14.26 11.24
Bottom of range [member] | US dollar to Brazilian real [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 4.44  
Top of range [member] | Euro to Mexican Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 30.14 23.06
Top of range [member] | Euro to Pound Sterling [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 0.99 0.91
Top of range [member] | Euro to South Korean Won [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1,492.76 1,377.10
Top of range [member] | Euro to US Dollar [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate   1.18
Top of range [member] | Pound Sterling to US Dollar [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1.36 1.43
Top of range [member] | US Dollar to Australian Dollar [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate   1.52
Top of range [member] | US Dollar to Chinese Yuan [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 7.51 7.30
Top of range [member] | US Dollar to Colombian Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 4,326.62 3,609.92
Top of range [member] | US Dollar to Euro [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 0.96 0.93
Top of range [member] | US Dollar to Mexican Peso [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 26.89 20.44
Top of range [member] | US Dollar to Nigerian Naira [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 426.33 374.60
Top of range [member] | US Dollar to Peruvian Nuevo Sol [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 3.75 3.47
Top of range [member] | US Dollar to South African Rand [member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 20.14 15.83
Top of range [member] | US Dollar to South Korean Won [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 1,359.95 1,244.42
Top of range [member] | US Dollar to Tanzanian Shilling [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 2,398.80 2,413.71
Top of range [member] | US Dollar to Zambian Kwacha [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 22.02 16.81
Top of range [member] | US dollar to Brazilian real [Member]    
Disclosure Of Foreign Currency Exchange Exposure [line items]    
Possible closing rate 6.51