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Acquisitions and Exit Activities - Schedule of Operating Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating losses |  | $ 428 | $ 3,336 | $ 8,445
WTAMC [Member] |  |  |  |
Operating losses |  | $ 428 | 2,786 | 3,925
WisdomTree Japan Inc. ("WTJ") [Member] |  |  |  |
Operating losses | [1] |  | $ 550 | $ 4,520
[1] | WTJ also recognized an impairment expense of $572 in connection with the termination of its office lease during the year ended December 31, 2019.

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