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Goodwill and Identifiable Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 3.5us-gaap_Goodwill $ 3.5us-gaap_Goodwill
Identifiable Intangible Asset 1.9us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 1.9us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
GSI [Member]    
Goodwill [Line Items]    
Goodwill 3.3us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
G.distributors, LLC [Member]    
Goodwill [Line Items]    
Goodwill $ 0.2us-gaap_Goodwill
/ dei_LegalEntityAxis
= gbl_GDistributorsLlcMember