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Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | $ 56,114 | $ 55,931 | $ 109,376 | $ 116,546
WisdomTree Trust [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 53,311 | 53,587 | 103,767 | 112,229
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 2,383 | 1,870 | 4,538 | 3,393
WisdomTree Commodity Services LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | 330 | $ 474 | 900 | $ 924
WisdomTree Asset Management Canada, Inc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from advisory services | $ 90 |  | $ 171 |

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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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