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Exit Activities - Additional Information (Detail) $ in Thousands, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Feb. 19, 2020 USD ($) | Feb. 19, 2020 CAD ($) | Sep. 30, 2020 USD ($)
Recognized gain loss on sale of business |  |  | $ 2,877
WisdomTree Asset Management Canada, Inc [Member] |  |  |
Proceeds from divestiture of businesses | $ 2,774 | $ 3,720 |
Term of contingent payments | 3 years | 3 years |
WisdomTree Asset Management Canada, Inc [Member] | Minimum [Member] |  |  |
Additional consideration payable |  | $ 2,000 |
WisdomTree Asset Management Canada, Inc [Member] | Maximum [Member] |  |  |
Additional consideration payable |  | $ 8,000 |

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