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Earnings (Loss) Per Common Share (Earnings Per Share Computation) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Earnings Per Share [Line Items]      
Net income attributable to Leucadia National Corporation common shareholders $ 380,759,000us-gaap_NetIncomeLoss $ 94,316,000us-gaap_NetIncomeLoss  
Allocation of earnings to participating securities (7,086,000)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic [1] (2,397,000)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic [1]  
Net income attributable to Leucadia National Corporation common shareholders for basic earnings (loss) per share 373,673,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 91,919,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic  
Adjustment to allocation of earnings to participating securities related to diluted shares 54,000us-gaap_UndistributedEarningsDiluted [1]    
Mandatorily redeemable convertible preferred share dividends 1,016,000us-gaap_ConvertiblePreferredDividendsNetOfTax 1,016,000us-gaap_ConvertiblePreferredDividendsNetOfTax  
Interest on 3.75% Convertible Notes   640,000us-gaap_InterestOnConvertibleDebtNetOfTax  
Net income attributable to Leucadia National Corporation common shareholders for diluted earnings (loss) per share 374,743,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 93,575,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted  
Denominator for basic earnings (loss) per share - weighted average shares 373,541,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 368,487,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Stock options 10,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 101,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Mandatorily redeemable convertible preferred shares 4,162,000luk_IncrementalCommonSharesAttributableToRedeemableConvertiblePreferredShares 4,162,000luk_IncrementalCommonSharesAttributableToRedeemableConvertiblePreferredShares  
Denominator for diluted earnings (loss) per share 377,713,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 377,348,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Weighted average shares of participating securities 7,114,000us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights 9,704,400us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights  
Dividends declared on participating securities $ 400,000luk_DividendsDeclaredOnParticipatingSecurities $ 600,000luk_DividendsDeclaredOnParticipatingSecurities  
3.875% Convertible Senior Debentures, due November 1, 2029 [Member]      
Earnings Per Share [Line Items]      
Convertible notes interest rate 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= luk_ThreePointEightSevenFivePercentageConvertibleSeniorDebenturesDueTwoThousandTwentyNineMember		   3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= luk_ThreePointEightSevenFivePercentageConvertibleSeniorDebenturesDueTwoThousandTwentyNineMember
3.75% Convertible Senior Subordinated Notes Due April 15, 2014 [Member]      
Earnings Per Share [Line Items]      
Convertible Debenture/Notes   4,598,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_DebtInstrumentAxis
= luk_ThreeAndThreeOverFourPercentConvertibleSeniorSubordinatedNotesDue2014Member		  
Convertible notes interest rate   3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= luk_ThreeAndThreeOverFourPercentConvertibleSeniorSubordinatedNotesDue2014Member		  
[1] Represents dividends declared during the period on participating securities plus an allocation of undistributed earnings to participating securities. Net losses are not allocated to participating securities. Participating securities represent restricted stock and RSUs for which requisite service has not yet been rendered and amounted to weighted average shares of 7,114,000 and 9,704,400 for the three months ended March 31, 2015 and 2014, respectively.