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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 24,055 | $ 26,884
WisdomTree Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 15,264 | 13,030
Manjer Issuers [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 6,053 | 11,693
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 2,738 | 2,125
WisdomTree Commodity Services LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties |  | $ 36

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