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Non-Current Investments - Additional Information (Detail) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2015 | Dec. 31, 2010 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Realized gain on disposal of listed investments before tax |  |  | $ 0.0 | $ 1.8 |  |  |  |
Far South East Project [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership % |  |  | 40.00% | 40.00% |  |  |  |
Pre-agreed acquisition, options to acquire |  |  | 20.00% |  |  |  |  |
Far South East Project [Member] | Lepanto Consolidated Mining Company |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership % |  |  | 60.00% |  |  |  |  |
Pre-agreed acquisition price for a 60% interest in FSE, option fees paid |  | $ 10.0 |  |  |  |  |  |
Far South East Project [Member] | Liberty Express Assets |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership % |  |  |  |  |  |  |  | 40.00%
Pre-agreed acquisition price for a 60% interest in FSE, non-refundable down payment |  | $ 44.0 |  |  |  | $ 110.0 | $ 66.0 |
Pre-agreed acquisition, options to acquire |  | 60.00% |  |  |  |  |  |
Hummingbird Resources Plc |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Percentage of shareholding, after issue of new shares | 19.90% |  |  |  |  |  |  |
Ownership % | 25.10% |  |  | 25.10% | [1] |  |  |
[1] | 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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