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Acquisition and Goodwill - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Apr. 15, 2014 USD ($) | Dec. 31, 2015 USD ($) Shareholder | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |
Remaining acquiree ownership percentage | 25.00% |  |  |
Acquisition ownership percentage |  | 88.00% |  |
Stock-based compensation expense |  | $ 10,900,000 | $ 8,137,000 | $ 6,459,000
Goodwill |  | 1,676,000 | $ 1,676,000 | $ 0
Chief Executive Officer [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Stock-based compensation expense |  | 997,000 |  |
Non-Employee Shareholders [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Interest expense |  | $ 1,188,000 |  |
WisdomTree Europe [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition ownership percentage | 75.00% |  |  |
Business acquisition consideration transferred | $ 0 |  |  |
Payout description |  | The ultimate payout will be made in cash over two years. |  |
Payout period | 2 years |  |  |
WisdomTree Europe [Member] | Chief Executive Officer [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Guaranteed minimum payment |  | $ 1,757,000 |  |
Boost Shareholders [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shareholders | Shareholder |  | 2 |  |
Percentage of minority shareholder's |  | 12.00% |  |
Redeemable noncontrolling interest, ownership percentage by noncontrolling owners |  | 25.00% |  |
Goodwill |  | $ 1,676,000 |  |
Purchase price |  | 1,757,000 |  |
Boost Shareholders [Member] | Fair Value [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of net assets acquired |  | $ 81,000 |  |

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