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Deferred Consideration - Schedule of Deferred Consideration (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Contractual gold payments $ 17,108 $ 17,096 $ 16,811
Contractual gold payments – gold ounces paid 9,500 9,500 9,500
Gain/(loss) on revaluation of deferred consideration - gold payments [1] $ 27,765 $ 2,018 $ (56,821)
[1] Gains on revaluation of deferred consideration—gold payments result from a decrease in spot gold prices, a decrease in the forward-looking price of gold, a decrease in the perpetual growth rate and an increase in the discount rate used to compute the present value of the annual payment obligations. Losses on revaluation of deferred consideration—gold payments result from an increase in spot gold prices, an increase in the forward-looking price of gold, an increase in the perpetual growth rate and a decrease in the discount rate used to compute the present value of the annual payment obligations.