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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Related Party Transaction [Line Items]
Revenue from related parties	$ 73,778	$ 55,856	$ 132,234	$ 108,884
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Revenue from related parties	52,591	53,311	107,792	103,767
ETFS Issuers [Member]
Related Party Transaction [Line Items]
Revenue from related parties	17,720		17,720
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	2,724	2,125	5,351	4,046
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Revenue from related parties	340	330	656	900
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 403	$ 90	$ 715	$ 171

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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=114873854&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=115205541&loc=SL114868664-224227

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