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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  | 0 Months Ended | 12 Months Ended |
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Dec. 31, 2013 State Street Bank and Trust Company [Member] | Jan. 31, 2014 Subsequent Events [Member] | Jan. 31, 2014 Subsequent Events [Member] Maximum [Member] | Dec. 31, 2013 Subsequent Events [Member] State Street Bank and Trust Company [Member] | Jan. 31, 2014 Subsequent Events [Member] Boost [Member]
Subsequent Event [Line Items] |  |  |  |  |
Agreement date | Sep. 30, 2013 |  |  |  |
Agreement effective date |  |  |  | Apr. 01, 2014 |
Amount expects to invest in working capital |  |  |  |  | $ 20
Business combination control description |  | Under the terms of the Company’s agreement with Boost, the Company will own 75% of the new WisdomTree Europe entity and the existing Boost shareholders will own 25%. The Company will acquire the remaining 25% ownership from existing Boost shareholders at the end of four years. The payout formula will be based on European AUM at the end of the four year period and will be tied to WisdomTree’s enterprise value over global AUM at the time of payout, and affected by profitability of the European business. The payout will be in cash over two years. Subject to regulatory approval and other customary closing conditions, the transaction is expected to close in the first half of 2014. |  |  |
Equity method investment, Ownership percentage |  | 75.00% |  |  | 25.00%
Time period over percentage change of ownership occur |  | 4 years |  |  |
Payout description |  | The payout will be in cash over two years. |  |  |
Payout period |  |  | 2 years |  |

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- Details
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