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Summary of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Basic earnings per common share, Net income attributable to SEI (Numerator) $ 65,515 $ 67,195 $ 83,494 $ 71,920 $ 56,585 $ 50,743 $ 49,555 $ 49,965 $ 288,124 $ 206,848 $ 204,959
Shares used to compute basic earnings per share                 171,561 174,295 182,547
Basic earnings per common share $ 0.39 $ 0.39 $ 0.48 $ 0.42 $ 0.33 $ 0.29 $ 0.28 $ 0.28 $ 1.68 $ 1.19 $ 1.12
Dilutive effect of stock options, Net income attributable to SEI (Numerator)                 0 0 0
Dilutive effect of stock options, shares                 4,157 1,577 1,580
Diluted earnings per common share, Net income attributable to SEI (Numerator)                 $ 288,124 $ 206,848 $ 204,959
Shares used to compute diluted earnings per share                 175,718 175,872 184,127
Diluted earnings per common share $ 0.37 $ 0.38 $ 0.47 $ 0.41 $ 0.32 $ 0.29 $ 0.28 $ 0.28 $ 1.64 $ 1.18 $ 1.11