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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
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