Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 20,169	$ 25,667
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	11,220	14,765
Manjer Issuers [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	7,612	9,036
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	1,283	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	$ 54	$ 80