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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
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Mar. 31, 2019 | Mar. 31, 2018
Related Party Transaction [Line Items] |  |
Revenues from advisory services | $ 64,840 | $ 58,456
WisdomTree Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Revenues from advisory services | 42,223 | 55,202
ETFS Issuers [Member] |  |
Related Party Transaction [Line Items] |  |
Revenues from advisory services | 19,273 |
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |
Related Party Transaction [Line Items] |  |
Revenues from advisory services | 2,504 | 2,626
WisdomTree Asset Management Canada, Inc [Member] |  |
Related Party Transaction [Line Items] |  |
Revenues from advisory services | 546 | 311
WisdomTree Commodity Services LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Revenues from advisory services | $ 294 | $ 317

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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=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 + Details
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