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Organization and Description of Business - Additional Information (Detail) $ in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 06, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Feb. 19, 2020 CAD ($) | Feb. 19, 2020 USD ($) | Nov. 06, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition of foreign currency translation adjustment upon the liquidation of WisdomTree Japan Inc. |  |  |  |  |  |  |  |  |  | $ 397 |  |  |  |  |
Operating losses |  | $ 14,809 | $ 16,131 | $ 11,911 | $ 10,683 | $ 11,819 | $ 21,708 | $ 14,531 | $ 13,221 | 53,534 | $ 61,279 | $ 49,088 |  |  |
CI Financial Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group discontinued operation term over which target shall be achieved | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wisdom Tree Asset Mangement Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group including discontinued operation operating income loss |  |  |  |  |  |  |  |  |  | 2,786 | 3,925 | 3,560 |  |  |
Wisdom Tree Asset Mangement Canada [Member] | CI Financial Corp [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront consideration due to WisdomTree for sale of WisdomTree Asset Management Canada |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 3,800,000 |
Other Nonoperating Gains and Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition of foreign currency translation adjustment upon the liquidation of WisdomTree Japan Inc. |  |  |  |  |  |  |  |  |  | 397 |  |  |  |  |
WisdomTree Japan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating losses |  |  |  |  |  |  |  |  |  | $ 550 | $ 4,520 | $ 4,553 |  |  |
Maximum [Member] | Wisdom Tree Asset Mangement Canada [Member] | CI Financial Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration payable to WisdomTree for sale of WisdomTree Asset Management Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,900
Consideration payable due to WisdomTree for sale of WisdomTree Asset Management Canada (in Canadian Dollars) | $ 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Wisdom Tree Asset Mangement Canada [Member] | CI Financial Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration payable to WisdomTree for sale of WisdomTree Asset Management Canada | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400
Acquisition of ETFS Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  |  | Apr. 11, 2018 |  |  |  |  |

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