Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Beef processing services	$ 1,852,311us-gaap_SalesRevenueGoodsNet	$ 1,885,754us-gaap_SalesRevenueGoodsNet
Commissions	166,922us-gaap_BrokerageCommissionsRevenue	162,063us-gaap_BrokerageCommissionsRevenue
Principal transactions	729,235us-gaap_PrincipalTransactionsRevenue	281,054us-gaap_PrincipalTransactionsRevenue
Investment banking	250,995us-gaap_InvestmentBankingRevenue	414,320us-gaap_InvestmentBankingRevenue
Interest income	237,599us-gaap_InterestIncomeOperating	257,660us-gaap_InterestIncomeOperating
Net realized securities gains	15,089us-gaap_GainLossOnInvestments	5,394us-gaap_GainLossOnInvestments
Other	124,370us-gaap_OtherIncome	132,832us-gaap_OtherIncome
Total revenues	3,376,521us-gaap_Revenues	3,139,077us-gaap_Revenues
Net revenues	3,184,683us-gaap_RevenuesNetOfInterestExpense	2,942,524us-gaap_RevenuesNetOfInterestExpense
Expenses:
Cost of sales	1,922,223us-gaap_CostOfGoodsSold	1,945,675us-gaap_CostOfGoodsSold
Compensation and benefits	410,852us-gaap_LaborAndRelatedExpense	565,837us-gaap_LaborAndRelatedExpense
Floor brokerage and clearing fees	55,080	49,570
Interest	30,449us-gaap_InterestExpense	28,576us-gaap_InterestExpense
Depreciation and amortization	52,440us-gaap_DepreciationAndAmortization	41,487us-gaap_DepreciationAndAmortization
Selling, general and other expenses	166,983us-gaap_GeneralAndAdministrativeExpense	174,319us-gaap_GeneralAndAdministrativeExpense
Total expenses	2,638,027us-gaap_CostsAndExpenses	2,805,464us-gaap_CostsAndExpenses
Income from continuing operations before income taxes and income related to associated companies	546,656	137,060
Income related to associated companies	40,451	20,036
Income from continuing operations before income taxes	587,107	157,096
Income tax provision	212,678us-gaap_IncomeTaxExpenseBenefit	56,250us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations	374,429	100,846
Loss from discontinued operations, net of income tax (benefit) of $0 and $(4,796)		(8,909)
Net income	374,429us-gaap_ProfitLoss	91,937us-gaap_ProfitLoss
Net (income) loss attributable to the noncontrolling interests	234	(2,537)
Net loss attributable to the redeemable noncontrolling interests	7,112	5,932
Preferred stock dividends	(1,016)	(1,016)
Net income attributable to Leucadia National Corporation common shareholders	380,759us-gaap_NetIncomeLoss	94,316us-gaap_NetIncomeLoss
Basic earnings (loss) per common share attributable to Leucadia National Corporation common shareholders:
Income from continuing operations	$ 1.00	$ 0.27
Loss from discontinued operations		$ (0.02)
Net income	$ 1.00us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per common share attributable to Leucadia National Corporation common shareholders:
Income from continuing operations	$ 0.99	$ 0.27
Loss from discontinued operations		$ (0.02)
Net income	$ 0.99us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted
Amounts attributable to Leucadia National Corporation common shareholders:
Income from continuing operations, net of taxes	380,759	103,205
Loss from discontinued operations, net of taxes		(8,889)
Net income attributable to Leucadia National Corporation common shareholders	380,759us-gaap_NetIncomeLoss	94,316us-gaap_NetIncomeLoss
Investment Banking And Capital Markets Segment [Member]
Expenses:
Interest	$ 191,838	$ 196,553

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Amount of commission revenue from buying and selling securities on behalf of customers.

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Total costs related to goods produced and sold during the reporting period.

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Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income after deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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