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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Amortization Expense Related to the SEI Wealth Platform | The Company currently expects to recognize amortization expense related to all capitalized software development costs placed into service as of December 31, 2017 each year from 2018 through 2022 as follows:
2018 | $ | 43,717 |
2019 | 43,717 |
2020 | 43,717 |
2021 | 43,439 |
2022 | 29,556 |
Calculation Of Basic And Diluted Earnings Per Share | The calculations of basic and diluted earnings per share for 2017, 2016 and 2015 are:
|  | 2017 |  | 2016 |  | 2015
Net income |  | $ | 404,389 |  |  | $ | 333,817 |  |  | $ | 331,655 |
Shares used to compute basic earnings per common share |  | 158,177,000 |  |  | 161,350,000 |  |  | 165,725,000 |
Dilutive effect of stock options |  | 4,092,000 |  |  | 3,081,000 |  |  | 3,873,000 |
Shares used to compute diluted earnings per common share |  | 162,269,000 |  |  | 164,431,000 |  |  | 169,598,000 |
Basic earnings per common share |  | $ | 2.56 |  |  | $ | 2.07 |  |  | $ | 2.00 |
Diluted earnings per common share |  | $ | 2.49 |  |  | $ | 2.03 |  |  | $ | 1.96 |

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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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