XML 442 R164.htm IDEA: XBRL DOCUMENT v3.19.1
Share Capital - Summary of Beneficial Shareholders (Detail)
 12 Months Ended
Dec. 31, 2018
shares
Government Employees Pension Fund [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 60,064,445
Percentage of issued ordinary shares 7.31%
VanEck Vectors Gold Miners ETF [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 58,229,560
Percentage of issued ordinary shares 7.09%
Market Vectors Junior Gold Mines ETF [member]  
Disclosure of beneficial ownership [line items]  
Number of shares 47,680,319
Percentage of issued ordinary shares 5.80%