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Intangible Assets and Goodwill (Details 3) (Amortizable asset management contracts, Consolidated Legg Mason, Inc., USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Amortizable asset management contracts | Consolidated Legg Mason, Inc.
   
Estimated amortization expense:    
Remaining 2013 $ 10,514  
2014 11,835  
2015 2,920  
2016 2,663  
2017 2,000  
Thereafter 0  
Total $ 29,932 $ 33,437
Amortizable intangible assets, useful life 2 years 292 days