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Interest in Joint Operation - Additional Information (Detail) oz in Millions, $ in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 13, 2016 | Dec. 31, 2017 USD ($) oz | Dec. 31, 2017 AUD ($) oz
Disclosure of joint operations [abstract] |  |  |
Percentage of ownership in joint operation: Gruyere Gold Project | 50.00% |  |
Proportion of ownership interest in joint venture with Gold Road Resources |  | 50.00% | 50.00%
Acquisition date fair value of total consideration transferred |  |  | $ 350.0
Percentage of royalty |  |  | 1.50%
Share of production after total mine production in ounces | oz |  | 2 | 2
Cash Consideration paid on effective date |  |  | $ 250.0
Cash consideration payable |  |  | 100.0
Transaction costs incurred |  | $ 13.3 | $ 18.5

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