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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Computation of earnings per share:                      
Net income (loss)                 $ 182,780us-gaap_ProfitLoss $ 17,840us-gaap_ProfitLoss $ (23,957)us-gaap_ProfitLoss
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds 2,155us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 4,006us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 5,216us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 4,187us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 2,684us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 4,759us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 2,255us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 3,495us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 15,564us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 13,193us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest (72)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Net income (loss) attributable to Cowen Group, Inc. stockholders $ 142,471us-gaap_NetIncomeLoss $ 6,523us-gaap_NetIncomeLoss $ 8,382us-gaap_NetIncomeLoss $ 9,840us-gaap_NetIncomeLoss $ 2,519us-gaap_NetIncomeLoss $ 3,611us-gaap_NetIncomeLoss $ 1,093us-gaap_NetIncomeLoss $ (2,576)us-gaap_NetIncomeLoss $ 167,216us-gaap_NetIncomeLoss $ 4,647us-gaap_NetIncomeLoss $ (23,885)us-gaap_NetIncomeLoss
Shares for basic and diluted calculations:                      
Weighted average shares used in basic computation, shares 113,492,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 114,969,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,569,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,680,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 117,514,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 118,359,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 117,235,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 113,798,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 114,926,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,703,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 114,400,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average shares used in diluted computation, shares 118,222,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 118,801,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 120,199,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 122,898,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 123,573,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 122,708,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 120,901,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 113,798,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 119,486,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 121,117,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 114,400,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per share:                      
Earnings Per Share, Basic (in dollars per share) $ 1.26us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.09us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ 0.03us-gaap_EarningsPerShareBasic $ 0.01us-gaap_EarningsPerShareBasic $ (0.02)us-gaap_EarningsPerShareBasic $ 1.45us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ (0.21)us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted (in dollars per share) $ 1.21us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.03us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ (0.02)us-gaap_EarningsPerShareDiluted $ 1.40us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ (0.21)us-gaap_EarningsPerShareDiluted
Warrants and Rights                      
Shares for basic and diluted calculations:                      
Shares attributable to share-based payment awards, shares                 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= cown_WarrantsAndRightsMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= cown_WarrantsAndRightsMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= cown_WarrantsAndRightsMember
Stock Options                      
Shares for basic and diluted calculations:                      
Shares attributable to share-based payment awards, shares                 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Stock Appreciation Rights (SARs)                      
Shares for basic and diluted calculations:                      
Shares attributable to share-based payment awards, shares                 60,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 306,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Restricted Stock                      
Shares for basic and diluted calculations:                      
Shares attributable to share-based payment awards, shares                 4,500,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 4,108,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Common Stock Class A                      
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Common stock, shares outstanding, shares 111,691,199us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		       115,026,633us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		       111,691,199us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 115,026,633us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Common stock, restricted shares, shares 424,479cown_CommonStockSharesRestricted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		       482,522cown_CommonStockSharesRestricted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		       424,479cown_CommonStockSharesRestricted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 482,522cown_CommonStockSharesRestricted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember