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Related Party Transactions (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
sqft
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Percentage of ownership (in hundredths) 55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
GGCP Holdings LLC [Member] | Common Class B [Member]      
Related Party Transaction [Line Items]      
Ownership percentage of voting rights (in hundredths) 94.00%gbl_OwnershipPercentageOfVotingRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GgcpHoldingsLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		    
Percentage of ownership (in hundredths) 72.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GgcpHoldingsLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		    
Entity controlled by members of the Chairman's family [Member]      
Capital Lease [Abstract]      
Area of lease space (in square feet) 60,000us-gaap_NetRentableArea
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_EntityControlledByMembersOfChairmanSFamilyMember		    
LICT Corporation [Member]      
Capital Lease [Abstract]      
Area of lease space (in square feet) 3,300us-gaap_NetRentableArea
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_LictCorporationMember		    
Sublease rental base rate $ 117,640gbl_SubleaseRentalBaseRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_LictCorporationMember		 $ 116,527gbl_SubleaseRentalBaseRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_LictCorporationMember		 $ 114,716gbl_SubleaseRentalBaseRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_LictCorporationMember
Sublease rental base rate (in dollars per square foot) 28gbl_SubleaseRentalBaseRateShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_LictCorporationMember		    
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) 3gbl_SubleaseRentalRateForUtilitiesAndTaxesOnSubleaseProperty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_LictCorporationMember		    
Teton [Member]      
Capital Lease [Abstract]      
Area of lease space (in square feet) 1,600us-gaap_NetRentableArea
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_TetonMember		    
Sublease rental base rate 68,697gbl_SubleaseRentalBaseRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_TetonMember		 68,189gbl_SubleaseRentalBaseRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_TetonMember		 67,361gbl_SubleaseRentalBaseRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_TetonMember
Sublease rental base rate (in dollars per square foot) 37.75gbl_SubleaseRentalBaseRateShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_TetonMember		    
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) 3gbl_SubleaseRentalRateForUtilitiesAndTaxesOnSubleaseProperty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_TetonMember		    
MJG Associates, Inc [Member] | G B L [Member] | Advisory fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 10,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_MjgAssociatesIncMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 10,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_MjgAssociatesIncMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 10,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_MjgAssociatesIncMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember
Manhattan Partners I, L.P [Member] | G B L [Member] | Advisory fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 14,483us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_ManhattanPartnersILpMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 21,601us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_ManhattanPartnersILpMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 21,660us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_ManhattanPartnersILpMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember
S.W.A.N. Partners, LP [Member] | G B L [Member] | Advisory fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 22,094us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_SwanPartnersLpMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 32,740us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_SwanPartnersLpMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 35,649us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_SwanPartnersLpMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember
GSI [Member]      
Related Party Transaction [Line Items]      
Percentage of ownership (in hundredths) 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember		    
GSI [Member] | Incentive fees from related party [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 20,886us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ gbl_RevenueTypeAxis
= gbl_IncentiveFeesFromRelatedPartyMember		 31,217us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ gbl_RevenueTypeAxis
= gbl_IncentiveFeesFromRelatedPartyMember		  
GSI [Member] | Gabelli Global Partners Ltd [Member] | Advisory fees [Member]      
Investment Advisory Services [Abstract]      
Due from Affiliates 0us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 0us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		  
GSI [Member] | Gemini Capital Management, LLC [Member] | Management fee [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 286,360us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GeminiCapitalManagementLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		 148,909us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GeminiCapitalManagementLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CoVenturerMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		  
Gabelli International Gold Fund Limited [Member] | Management fee [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 11,096us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GabelliInternationalGoldFundLimitedMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		 13,478us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GabelliInternationalGoldFundLimitedMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		 23,192us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GabelliInternationalGoldFundLimitedMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember
Due to Affiliate   50,639us-gaap_DueToAffiliateCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GabelliInternationalGoldFundLimitedMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		  
Gemini Capital Management, LLC [Member] | Gabelli Global Partners Ltd [Member] | Incentive fees from related party [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 178us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_IncentiveFeesFromRelatedPartyMember		 15,018us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_IncentiveFeesFromRelatedPartyMember		 0us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_IncentiveFeesFromRelatedPartyMember
Gemini Capital Management, LLC [Member] | Gabelli Global Partners Ltd [Member] | Advisory fees [Member]      
Investment Advisory Services [Abstract]      
Due from Affiliates 97,656us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 36,418us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= gbl_GabelliGlobalPartnersLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		  
Gemini Capital Management, LLC [Member] | Gemini Capital Management, LLC [Member] | Management fee [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 78,288us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GeminiCapitalManagementLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		 76,776us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GeminiCapitalManagementLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember		 76,548us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GeminiCapitalManagementLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_GeminiCapitalManagementLlcMember
/ gbl_RevenueTypeAxis
= gbl_ManagementFeeFromRelatedPartyMember
Affiliated funds [Member] | G B L [Member] | Advisory fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 600,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 900,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember		 1,000,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GBLMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryFeesMember
Affiliated funds [Member] | G.distributors, LLC [Member] | Advisory and distribution fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 31,600,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GDistributorsLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryAndDistributionFeesMember		 37,200,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GDistributorsLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_AdvisoryAndDistributionFeesMember		  
Affiliated funds [Member] | G.distributors, LLC [Member] | Distribution fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties $ 12,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GDistributorsLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_DistributionFeesMember		 $ 12,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GDistributorsLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_DistributionFeesMember		 $ 13,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= gbl_GDistributorsLlcMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbl_AffiliatedFundsMember
/ gbl_RevenueTypeAxis
= gbl_DistributionFeesMember