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Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | $ 227,775 | $ 218,465 | $ 297,944
WisdomTree Trust [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 215,513 | 209,199 | 293,788
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 10,288 | 7,251 | $ 4,156
WisdomTree Commodity Services LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | 1,508 | 1,867 |
WisdomTree Asset Management Canada, Inc [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from advisory services | $ 466 | $ 148 |

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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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- Definition 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. + References No definition available. + Details
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