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Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Accounts receivable from related parties $ 23,622 $ 24,670
WisdomTree Trust [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 13,920 14,678
ETFS Issuers [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 8,573 8,779
Boost Issuer PLC And WisdomTree Issuer plc [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 853 951
WisdomTree Asset Management Canada, Inc [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties 196 167
WisdomTree Commodity Services LLC [Member]    
Related Party Transaction [Line Items]    
Accounts receivable from related parties $ 80 $ 95