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AdvisorEngine - Financial Interests - Additional Information (Detail) - Advisor Engine [Member]
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Estimated Fair Value of Consideration Payable to WisdomTree $ 8,500
Maximum Amount of Contingent Payments That May be Received 11,500
Variable Interest Entity Nonconsolidated Carrying Amount Assets Impairment $ 19,672