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Contingent Payments - Additional Information (Detail) $ in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 19, 2020 USD ($) | Feb. 19, 2020 CAD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 CAD ($) | Dec. 31, 2020 USD ($) | May 04, 2020 USD ($)
Recognized gain loss on sale of business |  |  |  |  | $ 787 | $ 2,877 |  |  |
Impairment |  |  | $ 15,853 | $ 3,080 | 16,156 | 22,752 |  |  |
WisdomTree Asset Management Canada, Inc [Member] |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses | $ 2,774 | $ 3,720 |  |  |  |  |  |  |
Additional consideration payable |  |  | 2,360 |  | 2,360 |  | $ 3,000 |  |
Recognized gain loss on sale of business |  |  |  |  |  | 2,877 |  |  |
WisdomTree Asset Management Canada, Inc [Member] | Other gains and losses [Member] |  |  |  |  |  |  |  |  |
Recognized gain loss on sale of business |  |  | 787 |  |  |  |  |  |
WisdomTree Asset Management Canada, Inc [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Additional consideration payable |  |  |  |  |  |  | 0 |  |
WisdomTree Asset Management Canada, Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Additional consideration payable |  |  |  |  |  |  | $ 4,000 |  |
Advisor Engine [Member] |  |  |  |  |  |  |  |  |
Maximum Amount of Contingent Payments That May be Received |  |  |  |  |  |  |  |  | $ 10,408
Contingent payments |  |  | $ 0 |  | $ 0 |  |  | $ 0 |
Gain (Loss) on Disposition of Assets |  |  |  | $ 225 |  | 1,093 |  |  |
Advisor Engine [Member] | Fair Value Of Upfront Consideration Received [Member] |  |  |  |  |  |  |  |  |
Fair value of upfront consideration received |  |  |  |  |  |  |  |  | $ 9,592
Advisor Engine Financial Interest [Member] | Financial Interests [Member] |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  | $ 19,672 |  |  |

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