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Shareholders' Equity (Narrative) (Details)
 12 Months Ended
Dec. 15, 2023
$ / shares
May 31, 2023
$ / shares
Dec. 31, 2023
USD ($)
grantee
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 29, 2023
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average fair value of stock options granted (in USD per share) | $ / shares     $ 15.70 $ 17.95 $ 14.94  
(Decrease) increase in stock-based compensation from change in management's estimate     $ 6,941,000 $ 4,915,000 $ (5,880,000)  
Unvested employee stock options outstanding (in shares) | shares     10,661,000      
Unrecognized compensation cost from employee stock options     $ 89,130,000      
Weighted average period for recognition of unrecognized compensation cost     1 year 9 months 18 days      
Exercisable (in shares) | shares     6,759,000 9,043,000    
Options outstanding weighted average remaining contractual life, years     6 years 3 months 18 days      
Total intrinsic value of options exercised     $ 34,499,000 $ 36,576,000    
Aggregate intrinsic value of options exercisable     64,577,000      
Total intrinsic value of options outstanding     $ 103,189,000      
Share price of SEI common stock (in USD per share) | $ / shares           $ 63.55
Dividends declared per common share (in USD per share) | $ / shares $ 0.46 $ 0.43 $ 0.89 $ 0.83 $ 0.77  
Dividends declared     $ 117,894,000 $ 112,429,000 $ 107,840,000  
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average period for recognition of unrecognized compensation cost     1 year 9 months 10 days      
Unrecognized compensation cost from employee stock options     $ 39,905,000      
Share-Based Payment Arrangement, Option | Voluntary Separation Program            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of grantees affected | grantee     52      
Voluntary seperation program expense     $ 2,532,000      
Voluntary seperation program reversal     $ 1,783,000 3,562,000    
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award waiting period     2 years      
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award waiting period     4 years      
Common Stock Buyback            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining stock repurchase authorization amount     $ 282,079,000      
2014 Equity Compensation Plan | Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate     50.00%      
2014 Equity Compensation Plan | Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate     50.00%      
Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee stock purchase plan, employee eligible percentage on offerings of common stock     85.00%      
Shares reserved under the plan (in shares) | shares     15,652,000      
Issuance of common stock under the employee stock purchase plan (in shares) | shares     12,482,000      
Employee stock purchase plan     $ 0 $ 0 $ 0