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Business Combination - Summary of Operating Results of ETFS since the Acquisition Date (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Abstract] |  |  |  |  |
Revenues |  |  |  |  | $ 37,137
Income before taxes |  |  |  |  | 33,496
Gain on revaluation of deferred consideration | [1] | $ (6,306) | $ 7,732 | $ (5,939) | $ 17,630
[1] | 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.

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