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Organization and Business	9 Months Ended
Organization and Business	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business Cowen Inc. (formerly Cowen Group, Inc.), a Delaware corporation formed in 2009, is a diversified financial services firm which, together with its consolidated subsidiaries (collectively, “Cowen,” or the “Company”), operates through its two business segments: an investment management segment and an investment bank segment. The Company's investment management segment includes advisers to private funds, managed accounts, real estate funds, private equity structures and listed vehicles. The Company's investment bank segment offers investment banking, research, sales and trading, prime brokerage, global clearing and commission management services to companies and primarily institutional investor clients. The investment bank segment's primary target sectors ("Target Sectors") are healthcare, technology, media and telecommunications, information and technology services, consumer, aerospace and defense, industrials, energy and transportation.