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Carrying Value of Equity Investment in Far South East (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012		Dec. 31, 2011		Jun. 30, 2010
Gold Fields interest in FSE on December 31, 2012 was 40.0%.
Opening balance		$ 28.2	[1]
Share of losses recognized	4.9	(51.7)		4.0		(22.7)
Closing balance		254.4	[1]	28.2	[1]
Far Southeast (FSE) Deposit
Gold Fields interest in FSE on December 31, 2012 was 40.0%.
Investment		230.0
Equity contribution		50.1
Share of losses recognized		(50.1)
Closing balance		$ 230.0
[1] Equity investees comprise the following: Ownership % Market value Investment Description of business December 31, 2012 December 31, 2011 December 31, 2012 December 31, 2011 Far South East Exploration 40.0 - * * Rusoro Mining Limited Gold mining 26.4 26.4 6.3 13.1 Rand Refinery Limited Refining of gold bullion and by-products 34.9 34.9 * * Timpetra Resources Limited Resource exploration 21.8 21.8 1.0 1.2

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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