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Borrowings - Schedule of Borrowings (Parenthetical) (Detail)
R in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
ZAR (R)
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings $ 1,290,000,000      
Profit on buy back of notes 0 $ 0 $ 17,700,000  
Carrying value of asset 4,259,200,000 4,892,900,000    
Fleet assets and CIL plant [member] | Ghana [member]        
Disclosure of detailed information about borrowings [line items]        
Carrying value of asset   183,600,000    
US $1 Billion Notes [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 1,000,000,000      
Unamortized transaction costs 3,000,000 4,500,000    
Profit on buy back of notes   $ 17,700,000    
Term loan and revolving credit facility 1,290,000,000      
US$150 million revolving senior secured credit facility - old [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 150,000,000      
US$150 million revolving senior secured credit facility - new [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 150,000,000      
US$70 million revolving senior secured credit facility [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 70,000,000      
Amount available under the facility 70,000,000      
US$100 million revolving senior secured credit facility [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 100,000,000      
Amount available under the facility 100,000,000      
A$500 million syndicated revolving credit facility [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 500,000,000      
Facility A (US $380 Million) [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 380,000,000      
Facility B (US $360 Million) [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 360,000,000      
Facility C (US $550 Million) [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 550,000,000      
R 1,500 Million Nedbank Revolving Credit Facility [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings | R       R 1,500
R 1,500 million Nedbank revolving credit facility - new [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings | R       1,500
R 500 million Standard Bank revolving credit facility [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings | R       500
R 500 million Absa Bank revolving credit facility [member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings | R       R 500
US$1,290 Million Term Loan and Revolving Credit Facilities [Member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 1,290,000,000      
US $147.6 Million Notes [Member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 1,510,000,000      
Purchase of notes, amount 147,600,000      
Purchase price per US$1,000 $ 880      
Borrowing financed, description The purchase of the notes amounting to US$147.6 million was financed by drawing down under the US$1,510 million term loan and revolving credit facilities (these facilities were cancelled and refinanced through the US$1,290 million term loan and revolving credit facility on 6 June 2017). The Group recognised a profit of US$17.7 million on the buy back of the notes.