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Deferred Consideration - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) oz | Jun. 30, 2018 USD ($) oz | Apr. 11, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Fixed payments ounces of gold per year | oz | 9,500 | 9,500 |
Upfront consideration paid |  | $ 0 |
Deferred consideration | $ 162,848,000 | 162,848,000 | $ 172,746,000
Deferred consideration, current | 11,378,000 | 11,378,000 |
Deferred consideration, non-current | 151,470,000 | $ 151,470,000 |
Discount rate used to value the deferred consideration |  | 10.00% |
Contractual gold payments | 2,715,000 | $ 2,715,000 |
Gain/loss on revaluation of deferred consideration | $ 9,898,000 | $ 9,898,000 |
April 1, 2018 through March 31, 2058 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fixed payments ounces of gold per year | oz | 9,500 | 9,500 |
April 1, 2058 and Thereafter [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fixed payments ounces of gold per year | oz | 6,333 | 6,333 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Discount rate used to value the deferred consideration. + References No definition available. + Details
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- Details
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- Details
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