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