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Acquisition and Goodwill - Additional Information (Detail)
3 Months Ended 9 Months Ended
Apr. 15, 2014
USD ($)
Sep. 30, 2015
USD ($)
Shareholder
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Shareholder
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]            
Remaining acquiree ownership percentage 25.00%          
Acquisition ownership percentage       88.00%    
Stock-based compensation expense   $ 2,926,000 $ 2,077,000 $ 7,878,000 $ 6,122,000  
Goodwill   1,676,000   1,676,000   $ 1,676,000
Chief Executive Officer [Member]            
Business Acquisition [Line Items]            
Stock-based compensation expense   136,000   252,000    
Non-Employee Shareholders [Member]            
Business Acquisition [Line Items]            
Interest expense   36,000   $ 441,000    
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   $ 1,757,000    
Boost Shareholders [Member]            
Business Acquisition [Line Items]            
Number of shareholders | Shareholder   2   2    
Percentage of minority shareholder's   12.00%   12.00%    
Redeemable noncontrolling interest, ownership percentage by noncontrolling owners   25.00%   25.00%    
Goodwill   $ 1,676,000   $ 1,676,000    
Purchase price   1,757,000   1,757,000    
Boost Shareholders [Member] | Fair Value [Member]            
Business Acquisition [Line Items]            
Fair value of net assets acquired   $ 81,000   $ 81,000