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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]    
Accounts receivable from related parties $ 17,349 $ 25,047
WisdomTree Trust [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 16,506 24,560
Boost Issuer PLC And WisdomTree Issuer plc [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 645 $ 487
WisdomTree Commodity Services LLC [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 158  
WisdomTree Asset Management Canada, Inc [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties $ 40