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Redeemable Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Noncontrolling Interest [Line Items]      
Redeemable non-controlling interests in consolidated subsidiaries and funds $ 85,965us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue   $ 86,076us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds 2,720us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 4,187us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest  
Operating Entities      
Noncontrolling Interest [Line Items]      
Redeemable non-controlling interests in consolidated subsidiaries and funds 8,474us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
/ dei_LegalEntityAxis
= cown_OperatingCompaniesMember
  9,619us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
/ dei_LegalEntityAxis
= cown_OperatingCompaniesMember
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds 918us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= cown_OperatingCompaniesMember
3,439us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= cown_OperatingCompaniesMember
 
Consolidated Funds      
Noncontrolling Interest [Line Items]      
Redeemable non-controlling interests in consolidated subsidiaries and funds 77,491us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
/ dei_LegalEntityAxis
= cown_ConsolidatedFundsMember
  76,457us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
/ dei_LegalEntityAxis
= cown_ConsolidatedFundsMember
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds $ 1,802us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= cown_ConsolidatedFundsMember
$ 748us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= cown_ConsolidatedFundsMember