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Interest in Joint Operation - Additional Information (Detail) - Gruyere Gold project [member] oz in Millions, $ in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 13, 2016 | Dec. 31, 2018 USD ($) oz | Dec. 31, 2018 AUD ($) oz | Dec. 31, 2017 AUD ($) | Dec. 31, 2016 AUD ($)
Disclosure of joint operations [line items] |  |  |  |  |
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 |  |
Transaction costs paid |  |  | $ 15.0 | $ 78.0 | $ 7.0

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