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Subsequent Events - Summary of Allocation of Preliminary Purchase Price (Detail) $ / shares in Units, $ in Thousands | Apr. 11, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 1,799 | $ 1,799
Subsequent Event [Member] | Acquisition of ETFS Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total shares issued | shares | 30,000,000 |  |
WisdomTree stock price | $ / shares | $ 9.00 |  |
Equity portion of purchase price | $ 270,000 |  |
Term loan | 200,000 |  |
Cash on hand | 53,000 |  |
Purchase price | 523,000 |  |
Deferred consideration | 172,746 |  |
Total | 695,746 |  |
ETFS net assets acquired | 8,500 |  |
Intangible assets | 602,396 |  |
Fair value of net assets acquired | 610,896 |  |
Goodwill | $ 84,850 |  |
Subsequent Event [Member] | Preferred Stock [Member] | Acquisition of ETFS Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total shares issued | shares | 14,750 |  |
Conversion ratio | 1,000 |  |
Subsequent Event [Member] | Common Stock [Member] | Acquisition of ETFS Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Common stock equivalents | shares | 14,750,000 |  |
Total shares issued | shares | 15,250,000 |  |

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