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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 23,434 | $ 24,670
WisdomTree Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 13,514 | 14,678
Manjer Issuers [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 8,308 | 8,779
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 1,340 | 951
WisdomTree Asset Management Canada, Inc [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | 201 | 167
WisdomTree Commodity Services LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts receivable from related parties | $ 71 | $ 95

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