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Exit Activities - Schedule of Operating Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Operating losses |  | $ 428 | $ 1,207
WTAMC [Member] |  |  |
Operating losses |  | $ 428 | 777
WisdomTree Japan Inc. ("WTJ") [Member] |  |  |
Operating losses | [1] |  | $ 430
[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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