Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - Advisory Services [Member] - Related Party [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Revenues from advisory services	$ 82,004	$ 75,586	$ 159,641	$ 152,103
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	52,452	45,670	101,939	91,740
Manjer Issuers [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	25,794	26,282	50,634	53,187
WisdomTree Multi Asset Issuer PLC And WisdomTree Issuer PLC [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	$ 3,758	$ 3,634	$ 7,068	$ 7,176