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Exit Activities - Additional Information (Detail) $ in Thousands, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 19, 2020 USD ($) | Feb. 19, 2020 CAD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Proceeds from divestiture of businesses |  |  | $ 2,774 | $ 0
Recognized gain loss on sale of business |  |  | $ 2,877 | $ 0
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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