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Business Combination - Summary of Allocation of Purchase Price (Detail) $ / shares in Units, $ in Thousands | Apr. 11, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
WisdomTree stock price | $ / shares | $ 9.00 |  |
Goodwill |  | $ 85,856 | $ 1,799
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 (See Note 12) | 200,000 |  |
Cash on hand | 53,000 |  |
Purchase price | 523,000 |  |
Deferred consideration (See Note 11) | 172,746 |  |
Total | 695,746 |  |
Cash and cash equivalents | 13,687 |  |
Receivables and other current assets | 14,069 |  |
Intangible assets | 601,247 |  |
Other current liabilities | (17,314) |  |
Fair value of net assets acquired | 611,689 |  |
Goodwill | $ 84,057 |  |
Preferred Stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total shares issued | shares | 14,750 |  |
Preferred Stock [Member] | Acquisition of ETFS Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total shares issued | shares | 14,750 |  |
Conversion ratio | 1,000 |  |
Common Stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Common stock equivalents | shares | 14,750,000 |  |
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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