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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Calculation Of Basic And Diluted Earnings Per Share | The calculations of basic and diluted earnings per share for 2014, 2013 and 2012 are:
|  | For the Year Ended December 31, 2014
|  | Net income attributable to SEI (Numerator) |  | Shares (Denominator) |  | Per-Share Amount
Basic earnings per common share |  | $ | 318,713 |  |  | 168,246,000 |  |  | $ | 1.89 |
Dilutive effect of stock options |  | — |  |  | 4,319,000 |  |  |
Diluted earnings per common share |  | $ | 318,713 |  |  | 172,565,000 |  |  | $ | 1.85 |
|  | For the Year Ended December 31, 2013
|  | Net income attributable to SEI (Numerator) |  | Shares (Denominator) |  | Per-Share Amount
Basic earnings per common share |  | $ | 288,124 |  |  | 171,561,000 |  |  | $ | 1.68 |
Dilutive effect of stock options |  | — |  |  | 4,157,000 |  |  |
Diluted earnings per common share |  | $ | 288,124 |  |  | 175,718,000 |  |  | $ | 1.64 |
|  | 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 |  |  | 174,295,000 |  |  | $ | 1.19 |
Dilutive effect of stock options |  | — |  |  | 1,577,000 |  |  |
Diluted earnings per common share |  | $ | 206,848 |  |  | 175,872,000 |  |  | $ | 1.18 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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