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Equity-Accounted Investees - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 06, 2017
Aug. 22, 2016
Dec. 31, 2019
Dec. 31, 2018
Oct. 19, 2018
Jan. 01, 2018
Dec. 31, 2010
Disclosure of equity-accounted investees [line items]              
Carrying value write down due to loss incurred by the entity     $ 172,000,000 $ 225,100,000 [1]   $ 171,300,000  
Rusoro Mining Limited [member]              
Disclosure of equity-accounted investees [line items]              
Carrying value write down due to loss incurred by the entity             $ 0
Fair value of investment based on quoted market price     6,500,000 13,400,000      
Unrecognised share of profits     4,200,000 2,600,000      
Cumulative unrecognised share of losses     202,800,000 $ 198,600,000      
Pre and post award   $ 967,800,000          
Excess of pre and post award   $ 1,200,000,000          
Arbitration settlement $ 1,300,000,000            
Accrued interest percentage       9.00%      
Total settlement agreement amount         $ 1,280,000,000    
Maverix [member]              
Disclosure of equity-accounted investees [line items]              
Disposal of associates     33,800,000        
Derecognition Fair value of Investment     19,200,000        
Asanko Gold [member]              
Disclosure of equity-accounted investees [line items]              
Impact of fair value adjustment in property plant and equiment     $ 39,600,000        
[1] Refer note 42.