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Deferred Consideration (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Contractual Gold Payments $ 3,110 $ 2,715 $ 6,208 $ 2,715
Contractual Gold Payments – gold ounces paid 2,375 2,085 [1] 4,750 2,085 [1]
(Loss)/gain on revaluation of deferred consideration – gold payments $ (4,037) $ 9,898 $ 367 $ 9,898
[1] Represents payments during the period April 11, 2018 through June 30, 2018.