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Acquisitions and Exit Activities - Additional Information (Detail) $ in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 19, 2020 USD ($) | Feb. 19, 2020 CAD ($) | Apr. 11, 2018 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Recognized gain loss on sale of business |  |  |  | $ 2,877 |  |
Business acquistions proforma revenue |  |  |  |  |  | $ 297,541
Business acquistions proforma income |  |  |  |  |  | 37,336
Acquisition and disposition-related costs |  |  |  | $ 416 | $ 902 | $ 11,454
Acquisition of ETFS Business [Member] |  |  |  |  |  |
Business acquisition, cash paid |  |  | $ 253,000 |  |  |
Business acquisition, number of common shares that the preferred stock is convertible into | shares |  |  | 14,750,000 |  |  |
Acquisition of ETFS Business [Member] | Common Stock [Member] |  |  |  |  |  |
Business acquisition, number of shares to be issued | shares |  |  | 15,250,000 |  |  |
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 |  |  |  |
Series A Non-Voting Convertible Preferred Stock [Member] | Acquisition of ETFS Business [Member] |  |  |  |  |  |
Business acquisition, number of shares to be issued | shares |  |  | 14,750 |  |  |

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