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Share Capital - Summary of Share Capital (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Jul. 10, 2017
USD ($)
Disclosure of classes of share capital [line items]      
Balance beginning of year $ 3,571,464    
Balance end of year $ 3,723,482 $ 3,571,464  
Integra gold corporation [member]      
Disclosure of classes of share capital [line items]      
Shares issued for acquisition of Integra 77,180,898   77,180,898
Shares issued for acquisition of Integra $ 188,061   $ 188,061
Voting common shares [member]      
Disclosure of classes of share capital [line items]      
Beginning balance | shares 716,587,134 716,587,134  
Shares issued upon exercise of share options, for cash | shares 242,648    
Ending balance | shares 794,010,680 716,587,134  
Voting common shares [member] | Integra gold corporation [member]      
Disclosure of classes of share capital [line items]      
Shares issued for acquisition of Integra 77,180,898    
Share capital [member]      
Disclosure of classes of share capital [line items]      
Shares issued upon exercise of share options, for cash $ 586    
Estimated fair value of share options exercised 176    
Balance beginning of year 2,819,101 $ 5,319,101  
Capital reduction   (2,500,000)  
Balance end of year 3,007,924 $ 2,819,101  
Share capital [member] | Integra gold corporation [member]      
Disclosure of classes of share capital [line items]      
Shares issued for acquisition of Integra $ 188,061