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Share-Based Payments - Summary of Fair Value of Equity Instruments Granted (Detail) (Detail) - Performance Shares [Member] - Gold Fields Limited 2012 Share Plan Amended [member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Monte Carlo simulation
Weighted average historical volatility (based on a statistical analysis of the share price on a weighted moving average basis for the expected term of the option)	58.40%	44.70%	58.60%
Expected term (years)	3 years	3 years	3 years
Dividend yield	n/a	n/a	n/a
Weighted average three-year risk-free interest rate (based on US interest rates)	0.30%	1.40%	2.00%
Weighted average fair value (United States Dollar)	6.4	5.7	5.0

X

- Definition

The percentage of an expected dividends used to calculate the fair value of share options granted.

+ References

No definition available.

+ Details

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- Definition

Expected term in years share options granted.

+ References

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise).

+ References

No definition available.

+ Details

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X

- Definition

Share based compensation arrangement by share based payment award fair value of equity instruments methodology.

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award fair value of equity instruments weighted average fair value.

+ References

No definition available.

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X

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2020-01-01

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