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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 | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties | $ 71,679 | $ 57,293 | $ 203,913 | $ 166,177
WisdomTree Trust [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties | 49,900 | 54,439 | 157,693 | 158,206
ETFS Issuers [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties | 18,442 |  | 36,161 |
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties | 2,532 | 2,452 | 7,883 | 6,498
WisdomTree Asset Management Canada, Inc [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties | 489 | 92 | 1,204 | 263
WisdomTree Commodity Services LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties | $ 316 | $ 310 | $ 972 | $ 1,210

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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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- 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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