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Acquisitions and Exit Activities - Summary of Operating Results of ETFS since the Acquisition Date (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Acquisitions And Exit Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 55,882
Income before taxes |  |  |  |  |  |  |  |  |  |  | 23,197
(Loss)/gain on revaluation of deferred consideration | $ (22,385) | $ (8,870) | $ (23,358) | $ (2,208) | $ (5,354) | $ (6,306) | $ (4,037) | $ 4,404 | $ (56,821) | $ (11,293) | $ 12,220

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