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Acquisitions (Pro Forma Operating Results) (Details) (Jefferies [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Jefferies [Member]
Net revenues	$ 2,955,790
Net income attributable to Leucadia National Corporation common shareholders	$ 196,089
Basic income per common share attributable to Leucadia National Corporation common shareholders	$ 0.51
Diluted income per common share attributable to Leucadia National Corporation common shareholders	$ 0.51

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details