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Contingent Liabilities - Additional Information (Detail)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
ZAR (R)
Jun. 30, 2017
USD ($)
Dec. 31, 2015
USD ($)
Disclosure of contingent liabilities [line items]            
Provisions $ 321.3   $ 291.7 [1]      
Percentage of ownership interest in joint venture 50.00% 50.00%        
Amount of consolidated deferred tax asset $ 72.0   $ 48.7 [1]     $ 54.1
South Deep Tax Dispute [Member]            
Disclosure of contingent liabilities [line items]            
Tax rate for capital allowance 12.00% 12.00%        
Allowable percentage on actual capital expenditure on developing mine 12.00% 12.00%        
Alleged thefts [Member] | Randgold and Exploration Summons [Member]            
Disclosure of contingent liabilities [line items]            
Amount of summons claims computed pursuant to allegedly received | R       R 43,700.0    
GFI Joint Venture Holdings (Proprietary) Limited [Member] | South African Revenue Service [Member] | Additional capital allowances [Member]            
Disclosure of contingent liabilities [line items]            
Amount of unredeemed capital expenditure included in the deferred tax asset balance $ 0.0     0.0    
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance 54.7 R 687.6        
Additional capital allowance balance restated by SARS recognised 182.2     2,292.0    
South Deep Tax Dispute [Member]            
Disclosure of contingent liabilities [line items]            
Percentage of ownership interest in joint venture     50.00%      
South Deep Tax Dispute [Member] | Temporary Differences [Member]            
Disclosure of contingent liabilities [line items]            
Amount of unredeemed capital expenditure included in the deferred tax asset balance 1,834.4     23,076.4    
Amount of consolidated deferred tax asset 550.4     6,923.0    
South Deep Tax Dispute [Member] | GFIJVH [Member] | Unredeemed Capital Expenditure [Member]            
Disclosure of contingent liabilities [line items]            
Amount of unredeemed capital expenditure included in the deferred tax asset balance 743.3     9,350.3    
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance 223.0 2,805.1        
South Deep Tax Dispute [Member] | GFIJVH [Member] | Capital Allowance Balance [Member]            
Disclosure of contingent liabilities [line items]            
Amount of unredeemed capital expenditure included in the deferred tax asset balance 182.2     2,292.0    
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance 54.7 687.6        
South Deep Tax Dispute [Member] | Gold Fields Operations [member] | Additional capital allowances [Member]            
Disclosure of contingent liabilities [line items]            
Amount of unredeemed capital expenditure included in the deferred tax asset balance 716.4     9,011.9    
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance 214.9 2,703.6        
South Deep Tax Dispute [Member] | GFO [Member] | Assessed Losses [Member]            
Disclosure of contingent liabilities [line items]            
Gross deductible temporary differences, assessed loss balance 192.5 2,422.2        
Gross deductible temporary differences, tax effect on assessed loss balance 57.8 R 726.7        
Silicosis [Member]            
Disclosure of contingent liabilities [line items]            
Provisions 31.9       $ 30.2  
Nominal amount of provision $ 40.5     509.0 $ 40.5  
South Deep Mine [member] | GFI Joint Venture Holdings (Proprietary) Limited [Member]            
Disclosure of contingent liabilities [line items]            
Percentage of ownership interest in joint venture     50.00%      
Based On Value Of Shares [Member] | Alleged thefts [Member] | Randgold and Exploration Summons [Member]            
Disclosure of contingent liabilities [line items]            
Amount of summons claims computed pursuant to allegedly received | R       R 26,900.0    
[1] As Restated - Refer note 40 for further details.