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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 | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | [1] | Dec. 31, 2018 | [1]
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | $ 55,882 |  |
Income before taxes |  |  |  |  |  |  |  | 23,197 |  |
(Loss)/gain on revaluation of deferred consideration | $ (5,354) | $ (6,306) | $ (4,037) | $ 4,404 | $ (5,410) | $ 7,732 | $ 9,898 | $ 12,220 | $ (11,293) | $ 12,220
[1] | (Losses)/gains arise due to increases/(decreases) 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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