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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 24,865 | $ 20,596
WisdomTree Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 16,057 | 19,433
ETFS Issuers [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 7,684 |
Boost Issuer PLC And WisdomTree Issuer plc [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 861 | 979
WisdomTree Asset Management Canada, Inc [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 163 | 87
WisdomTree Commodity Services LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 100 | $ 97

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