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Other Revenues and Expenses (Details) (USD $)
1 Months Ended 12 Months Ended
Jun. 30, 2008
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other revenues and expenses        
Contingent liability adjustment   $ 2,055,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Sale Leaseback Transaction, Current Period Gain Recognized 500,000us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized      
Lessee Leasing Arrangements, Operating Leases, Term of Contract   0 years 67 months 0 days    
October LLC [Member]        
Other revenues and expenses        
Sale Leaseback Transaction, Current Period Gain Recognized     500,000us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
/ dei_LegalEntityAxis
= cown_OctoberLlcMember
500,000us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
/ dei_LegalEntityAxis
= cown_OctoberLlcMember
Sale Leaseback Transaction, Deferred Gain, Gross 2,800,000us-gaap_SaleLeasebackTransactionDeferredGainGross
/ dei_LegalEntityAxis
= cown_OctoberLlcMember
     
Orchard Square Partners        
Other revenues and expenses        
Gain (Loss) on Disposition of Business   $ 4,500,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_UnderlyingAssetClassAxis
= cown_OrchardSquarePartnersMember