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Exit Activities - Schedule of Operating Losses (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating losses		$ 587	$ 428	$ 2,436
WTAMC [Member]
Operating losses		502	$ 428	1,886
WisdomTree Japan Inc. ("WTJ") [Member]
Operating losses	[1]	$ 85		$ 550
[1] WTJ also recognized an impairment expense of $572 in connection with the termination of its office lease on March 31, 2019.

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- Definition

Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

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