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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