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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Calculation Of Basic And Diluted Earnings Per Share | The calculations of basic and diluted earnings per share for 2012, 2011, and 2010 are:
|  | For the Year Ended December 31, 2012
|  | Net income attributable to SEI (Numerator) |  | Shares (Denominator) |  | Per-Share Amount
Basic earnings per common share |  | $ | 206,848 |  |  | 174,295 |  |  | $ | 1.19 |
Dilutive effect of stock options |  | — |  |  | 1,577 |  |  |
Diluted earnings per common share |  | $ | 206,848 |  |  | 175,872 |  |  | $ | 1.18 |
|  | For the Year Ended December 31, 2011
|  | Net income attributable to SEI (Numerator) |  | Shares (Denominator) |  | Per-Share Amount
Basic earnings per common share |  | $ | 204,959 |  |  | 182,547 |  |  | $ | 1.12 |
Dilutive effect of stock options |  | — |  |  | 1,580 |  |  |
Diluted earnings per common share |  | $ | 204,959 |  |  | 184,127 |  |  | $ | 1.11 |
|  | For the Year Ended December 31, 2010
|  | Net income attributable to SEI (Numerator) |  | Shares (Denominator) |  | Per-Share Amount
Basic earnings per common share |  | $ | 231,687 |  |  | 188,468 |  |  | $ | 1.23 |
Dilutive effect of stock options |  | — |  |  | 1,853 |  |  |
Diluted earnings per common share |  | $ | 231,687 |  |  | 190,321 |  |  | $ | 1.22 |
Employee stock options to purchase approximately 13,202,000, 15,914,000, and 13,181,000 shares of common stock, with an average exercise price per share of $24.76, $23.07, and $23.79, were outstanding during 2012, 2011, and 2010, respectively, but not included in the computation of diluted earnings per common share because the option’s exercise price was greater than the average market price of the Company’s common stock and the effect on diluted earnings per common share would have been anti-dilutive (See Note 8).

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