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Acquisition and Goodwill - Additional Information (Detail) (USD $)
0 Months Ended 9 Months Ended
Apr. 15, 2014
Sep. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Time period over percentage change of ownership occur 4 years    
Business acquisition consideration transferred $ 0    
Payout description   The ultimate payout will be made in cash over two years.  
Payout period 4 years    
Acquisition transaction cost   1,607,000  
Goodwill   1,676,000   
WisdomTree Europe [Member]
     
Business Acquisition [Line Items]      
Acquisition ownership percentage 75.00%    
Boost Shareholders [Member]
     
Business Acquisition [Line Items]      
Acquisition ownership percentage 25.00% 88.00%  
Number of shareholders   2  
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  
Boost Shareholders [Member] | Minimum [Member]
     
Business Acquisition [Line Items]      
Acquisition transaction cost   $ 1,757,000