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Intangible Assets and Goodwill (Details 2) (Amortizable asset management contracts, Legg Mason, Inc., USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Amortizable asset management contracts | Legg Mason, Inc.
   
Estimated amortization expense:    
Remaining 2014 $ 5,072  
2015 3,405  
2016 3,148  
2017 2,484  
2018 485  
Thereafter 485  
Total $ 15,079 $ 22,327
Amortizable intangible assets, useful life 2 years 329 days