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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |
Gains and (losses) related to certain WisdomTree ETFs | $ (451) | $ 63 | $ 40
WisdomTree ETF [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Investment | $ 18,526 | $ 23,932 |

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