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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Feb. 19, 2015
Jun. 30, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol WETF    
Entity Registrant Name WisdomTree Investments, Inc.    
Entity Central Index Key 0000880631    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   134,852,119dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 1,345,558,879dei_EntityPublicFloat