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v3.19.2

Deferred Consideration - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) oz | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |
Upfront consideration paid | $ 0 |
Deferred consideration | 161,273,000 | $ 161,540,000
Deferred consideration, current | 12,857,000 | 11,765,000
Deferred consideration, non-current | $ 148,416,000 | $ 149,775,000
Discount rate used to value the deferred consideration | 10.00% | 10.00%
Perpetual Growth Rate | 1.50% | 1.50%
April 1, 2018 through March 31, 2058 [Member] |  |
Business Acquisition [Line Items] |  |
Fixed payment ounces of gold | oz | 9,500 |
April 1, 2058 and Thereafter [Member] |  |
Business Acquisition [Line Items] |  |
Fixed payment ounces of gold | oz | 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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