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Carrying Value of Equity Investment (Detail) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Carrying amount of investment	[1]	$ 129.1	$ 250.5
Far South East Project [Member]
Schedule of Equity Method Investments [Line Items]
Carrying amount of investment		128.6	230.0	$ 230.0
Bezant Resources Plc
Schedule of Equity Method Investments [Line Items]
Carrying amount of investment		$ 0.5	1.3
Hummingbird Resources Plc
Schedule of Equity Method Investments [Line Items]
Carrying amount of investment			$ 19.2
[1] Equity investees comprise the following: Ownership % Market value Investment Description of business December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Far South East Exploration 40.0 40.0 128.6 * Rusoro Mining Limited Gold mining 26.4 26.4 5.0 1.8 Bezant Resources Plc1 Exploration 21.6 21.6 0.5 1.3 Hummingbird Resources Plc2 Exploration - 25.1 - 10.9 * - Not readily determinable. (1) During fiscal 2014, the investment in Bezant Resources Plc was impaired by $7.4 million to its fair value, as determined by its quoted market price. This impairment is considered other than temporary as the carrying value has been below the fair value for an extended period of time. (2) During fiscal 2014, Gold Fields acquired a 25.1% interest in Hummingbird Resources Plc (Refer note 3(c) for further details).

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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No definition available.

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