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Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - Advisory Services [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | $ 63,919 | $ 67,006 | $ 184,077 | $ 197,473
WisdomTree Trust [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 33,767 | 41,721 | 104,757 | 126,761
Manjer Issuers [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 27,397 | 21,758 | 71,325 | 60,398
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 2,603 | 2,670 | 7,145 | 7,757
WisdomTree Asset Management Canada, Inc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services |  | 628 | 365 | 1,781
WisdomTree Commodity Services LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | $ 152 | $ 229 | $ 485 | $ 776

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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