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Acquisitions (Tables)
3 Months Ended
Mar. 31, 2012
Acquisitions [Abstract]  
Pro Forma Operating Results
Revenues and other income
  $ 1,936,880  
Net income attributable to Leucadia National Corporation
       
  common shareholders
  $ 36,202  
Basic earnings per common share attributable to Leucadia National
       
  Corporation common shareholders
  $ .15  
Diluted earnings per common share attributable to Leucadia National
       
  Corporation common shareholders
  $ .15