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Organization and Description of Business - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Operating income | $ 11,911 | $ 14,531 | $ 22,594 | $ 27,752
WisdomTree Japan [Member] |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Operating income | $ 35 | $ 1,125 | 465 | $ 2,357
Impairment - Japan office lease |  |  | $ 572 |
Acquisition of ETFS Business [Member] |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Apr. 11, 2018 |

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