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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]    
Accounts receivable from related parties $ 22,026 $ 25,667
WisdomTree Trust [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 10,974 14,765
Manjer Issuers [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 10,159 9,036
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 850 1,559
WisdomTree Asset Management Canada, Inc [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties   227
WisdomTree Commodity Services LLC [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties $ 43 $ 80