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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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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

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