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Investment In Unconsolidated Affiliates (Condensed Statement Of Operations Of LSV) (Details) (L S V Asset Management [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
L S V Asset Management [Member]
       
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Summarized Financial Information, Revenue $ 92,184 $ 74,163 $ 256,782 $ 220,817
Equity Method Investment, Summarized Financial Information, Net Income (Loss) $ 79,555 $ 62,946 $ 220,657 $ 186,991