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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 20,596 | $ 17,349
WisdomTree Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 19,433 | 16,506
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 979 | 645
WisdomTree Commodity Services LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 97 | 158
WisdomTree Asset Management Canada, Inc [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 87 | $ 40

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