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Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - Advisory Services [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | $ 250,182 | $ 265,652 | $ 271,104
WisdomTree Trust [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 141,079 | 169,483 | 203,031
Manjer Issuers [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 97,986 | 82,224 | 54,601
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 10,124 | 10,499 | 10,448
WisdomTree Commodity Services LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 628 | 1,006 | 1,267
WisdomTree Asset Management Canada, Inc [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | $ 365 | $ 2,440 | $ 1,757

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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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