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Impairments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impairment	$ 15,853	$ 303	$ 3,080	$ 19,672	$ 16,156	$ 22,752	$ 30,710
WisdomTree Japan [Member]
Impairment					0		572
Advisor Engine [Member]
Gain (Loss) on Disposition of Assets					1,093
Advisor Engine - Financial ineterest [Member] | Financial Interests [Member]
Impairment					0	19,672	$ 30,138
Thesys – Series Y Preferred [Member]
Impairment					$ 0	3,080
Gain (Loss) on Disposition of Assets						$ 0

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
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-Publisher FASB
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-Topic 360
-SubTopic 10
-Section 45
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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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