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Organization and Business	12 Months Ended
Organization and Business	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business Cowen Group, Inc., a Delaware corporation formed in 2009, is a diversified financial services firm and, together with its consolidated subsidiaries (collectively, “Cowen,” “Cowen Group” or the “Company”), provides alternative investment management, investment banking, research, and brokerage (including market-making and sales and trading) through its two business segments: alternative investment and broker-dealer. Ramius, the Company's alternative investment segment, includes hedge funds, replication products, liquid alternative risk premia products, customized solutions, mutual funds, managed futures funds, fund of funds, real estate and healthcare royalty funds. Cowen, the Company's broker-dealer segment offers research, brokerage and investment banking services to companies and institutional investor clients primarily in the healthcare, technology, media and telecommunications, information and technology services, consumer, aerospace and defense, industrials, real estate investment trusts ("REITs"), clean technology, energy, metals and mining, transportation, chemicals and agriculture sectors.