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Impairments - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended				12 Months Ended
	Dec. 29, 2017	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible assets related to its customary advisory agreement				$ 603,294		$ 601,247	$ 603,294
Impairment		$ 3,080	$ 19,672	$ 30,138	$ 572	22,752	30,710	$ 17,386
WisdomTree Japan [Member]
Impairment							$ 572	326
GreenHaven Commodity Services, LLC [Member]
Intangible assets related to its customary advisory agreement						$ 9,953
Impairment								9,953
GreenHaven Commodity Services, LLC [Member] | Revenue Growth Rate Maximum [Member]
Projected revenue growth rates						5.00%
GreenHaven Commodity Services, LLC [Member] | Revenue Growth Rate Minimum [Member]
Projected revenue growth rates						0.00%
Advisor Engine [Member]
Impairment								$ 3,278
Weighted average cost of capital percentage	27.00%
Option volatility rate	40.00%

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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Estimated weighted average cost of capital.

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- Definition

Fair Value Inputs Volatility

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