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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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