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Acquisition (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 0 $ 0     $ 900,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 6,700,000 6,700,000     $ 7,100,000
Concept (Cowen Prime)          
Business Acquisition [Line Items]          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low 0 0      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 6,700,000 6,700,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       $ 25,200,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents       1,600,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment       600,000  
Intangible Assets, Net (Including Goodwill)       17,800,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets       5,100,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities       2,600,000  
Business Acquisition, Transaction Costs       $ 600,000  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual 2,200,000        
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual $ 100,000        
Revenues   375,651,000 $ 328,677,000    
Net income (loss) attributable to Cowen Group, Inc. common stockholders   $ 12,952,000 $ 24,840,000    
Net income per common share - Basic (in dollars per share)   $ 0.12 $ 0.21    
Net income per common share - Diluted (in dollars per share)   $ 0.11 $ 0.21