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Deferred Consideration - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 11, 2018 USD ($) | Sep. 30, 2018 USD ($) oz | Sep. 30, 2018 USD ($) oz | Sep. 30, 2018 USD ($) oz
Business Acquisition [Line Items] |  |  |  |
Fixed payments ounces of gold per year | oz |  | 9,500 | 9,500 | 9,500
Upfront consideration paid |  |  |  | $ 0
Deferred consideration | $ 172,746,000 | $ 156,055,000 | $ 156,055,000 | 156,055,000
Deferred consideration, current |  | 11,788,000 | 11,788,000 | 11,788,000
Deferred consideration, non-current |  | $ 144,267,000 | 144,267,000 | $ 144,267,000
Discount rate used to value the deferred consideration | 10.00% | 10.00% |  | 10.00%
Contractual gold payments |  | $ 2,880,000 |  | $ 5,595,000
Gain/loss on revaluation of deferred consideration |  | $ 7,732,000 | $ 17,630,000 | $ 17,630,000
April 1, 2018 through March 31, 2058 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fixed payments ounces of gold per year | oz |  | 9,500 | 9,500 | 9,500
April 1, 2058 and Thereafter [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fixed payments ounces of gold per year | oz |  | 6,333 | 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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- Definition Amount of liability arising from deferred consideration in a business combination. + References No definition available. + Details
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- Definition Deferred consideration - noncurrent. + References No definition available. + Details
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- Definition Gain/loss from revaluation of deferred consideration. + References No definition available. + Details
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- Details
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- Details
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