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Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | $ 57,574 | $ 51,553 | $ 166,950 | $ 168,099
WisdomTree Trust [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 54,439 | 49,087 | 158,206 | 161,316
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 2,733 | 1,915 | 7,271 | 5,308
WisdomTree Commodity Services LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 310 | 482 | 1,210 | 1,406
WisdomTree Asset Management Canada, Inc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | $ 92 | $ 69 | $ 263 | $ 69

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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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