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Business Combination - Summary of Allocation of Preliminary Purchase Price (Detail)
$ / shares in Units, $ in Thousands
Apr. 11, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
WisdomTree stock price | $ / shares $ 9.00    
Goodwill   $ 85,856 $ 1,799
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 (See Note 12) 200,000    
Cash on hand 53,000    
Purchase price 523,000    
Deferred consideration (See Note 11) 172,746    
Total 695,746    
Cash and cash equivalents 19,828    
Receivables and other current assets 14,069    
Intangible assets 601,247    
Other current liabilities (23,455)    
Fair value of net assets acquired 611,689    
Goodwill $ 84,057    
Preferred Stock [Member]      
Business Acquisition [Line Items]      
Total shares issued | shares 14,750    
Preferred Stock [Member] | Acquisition of ETFS Business [Member]      
Business Acquisition [Line Items]      
Total shares issued | shares 14,750    
Conversion ratio 1,000    
Common Stock [Member]      
Business Acquisition [Line Items]      
Common stock equivalents | shares 14,750,000    
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