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Loans To And Investments In Associated Companies (Schedule Of Income (Losses) Related To Associated Companies Classified As Other Revenue) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investments In Associated Companies [Line Items]    
Income (losses) related to associated companies classified as Other revenue $ 20,689luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue $ 20,627luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
Jefferies Finance [Member]    
Investments In Associated Companies [Line Items]    
Income (losses) related to associated companies classified as Other revenue 11,311luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
/ dei_LegalEntityAxis
= luk_JefferiesFinanceLlcMember		 17,601luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
/ dei_LegalEntityAxis
= luk_JefferiesFinanceLlcMember
Jefferies LoanCore [Member]    
Investments In Associated Companies [Line Items]    
Income (losses) related to associated companies classified as Other revenue 9,858luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
/ dei_LegalEntityAxis
= luk_JefferiesLoancoreLlcMember		 2,482luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
/ dei_LegalEntityAxis
= luk_JefferiesLoancoreLlcMember
Other [Member]    
Investments In Associated Companies [Line Items]    
Income (losses) related to associated companies classified as Other revenue $ (480)luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
/ dei_LegalEntityAxis
= luk_AssociatedCompaniesOtherMember		 $ 544luk_IncomeLossesRelatedToAssociatedCompaniesAmountsClassifiedAsOtherRevenue
/ dei_LegalEntityAxis
= luk_AssociatedCompaniesOtherMember