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Subsequent Events - Summary of Allocation of Preliminary Purchase Price (Detail)
$ / shares in Units, $ in Thousands
Apr. 11, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Goodwill   $ 1,799 $ 1,799
Subsequent Event [Member] | Acquisition of ETFS Business [Member]      
Business Acquisition [Line Items]      
Total shares issued | shares 30,000,000    
WisdomTree stock price | $ / shares $ 9.00    
Equity portion of purchase price $ 270,000    
Term loan 200,000    
Cash on hand 53,000    
Purchase price 523,000    
Deferred consideration 172,746    
Total 695,746    
ETFS net assets acquired 8,500    
Intangible assets 602,396    
Fair value of net assets acquired 610,896    
Goodwill $ 84,850    
Subsequent Event [Member] | Preferred Stock [Member] | Acquisition of ETFS Business [Member]      
Business Acquisition [Line Items]      
Total shares issued | shares 14,750    
Conversion ratio 1,000    
Subsequent Event [Member] | Common Stock [Member] | Acquisition of ETFS Business [Member]      
Business Acquisition [Line Items]      
Common stock equivalents | shares 14,750,000    
Total shares issued | shares 15,250,000