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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 22,026 | $ 25,667
WisdomTree Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 10,974 | 14,765
Manjer Issuers [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 10,159 | 9,036
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 850 | 1,559
WisdomTree Asset Management Canada, Inc [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties |  | 227
WisdomTree Commodity Services LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 43 | $ 80

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