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Deferred Consideration (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Contractual Gold Payments $ 3,502 $ 2,880 $ 9,710 $ 5,595
Contractual Gold Payments – gold ounces paid 2,375 2,375 7,125 4,460 [1]
(Loss)/gain on revaluation of deferred consideration – gold payments [2] $ (6,306) $ 7,732 $ (5,939) $ 17,630
[1] Represents payments during the period April 11, 2018 through September 30, 2018.
[2] Gains/(losses) arise due to (decreases)/increases in the forward-looking price of gold and the magnitude of any gain or loss is highly correlated to the magnitude of the change in the forward-looking price of gold. See Note 5 for a reconciliation of changes in the deferred consideration balances.