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Investments In Associated Companies (Schedule Of Income (Losses) Related To Associated Companies) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes $ (350,216) $ (225,940) $ 51,692 $ (270,112)
Income tax provision (benefit) (123,896) (80,144) 15,473 (96,268)
Income (losses) related to associated companies, net of taxes (226,320) (145,796) 36,219 (173,844)
Jefferies Group, Inc. [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes (334,985) (239,813) (35,384) (319,515)
Mueller [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes (28,767)   45,548  
JHYH [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes 4,579 (1,003) 14,273 13,925
Berkadia [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes 2,410 7,037 14,230 21,696
Garcadia Companies [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes 8,888 4,703 16,982 8,998
Linkem [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes (4,078)   (8,268)  
HomeFed Corporation [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes (447) (404) (562) (422)
Brooklyn Renaissance Plaza [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes 1,540 2,071 1,981 2,714
Associated Companies Other [Member]
        
Investments In Associated Companies [Line Items]        
Income (losses) related to associated companies before income taxes $ 644 $ 1,469 $ 2,892 $ 2,492