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Exit Activities - Schedule of Operating Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Operating losses |  |  | $ 642 | $ 428 | $ 1,849
WTAMC [Member] |  |  |  |  |
Operating losses |  |  | 607 | $ 428 | 1,384
WisdomTree Japan Inc. ("WTJ") [Member] |  |  |  |  |
Operating losses | [1] |  | $ 35 |  | $ 465
[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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