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Shareholders' Equity (Narrative) (Details)
12 Months Ended
Jun. 01, 2022
$ / shares
Dec. 10, 2021
$ / shares
Dec. 31, 2022
USD ($)
grantees
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / 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     $ 17.95 $ 14.94 $ 13.53
Increase (decrease) in stock-based compensation from change in management's estimate     $ (4,915,000) $ 5,880,000 $ (2,659,000)
Unvested employee stock options outstanding (in shares) | shares     9,727,000    
Unrecognized compensation cost from employee stock options     $ 95,848,000    
Weighted average period for recognition of unrecognized compensation cost     2 years    
Total options that were exercisable (in shares) | shares     9,043,000 8,638,000  
Options outstanding weighted average remaining contractual life, years     6 years 7 months 6 days    
Total intrinsic value of options exercised     $ 36,576,000 $ 55,029,000  
Aggregate intrinsic value of options exercisable     67,455,000    
Total intrinsic value of options outstanding     $ 79,468,000    
Share price of SEI common stock (in USD per share) | $ / shares     $ 58.30    
Dividends declared per common share (in USD per share) | $ / shares $ 0.40 $ 0.43 $ 0.83 $ 0.77 $ 0.72
Dividends declared     $ 112,429,000 $ 107,840,000 $ 104,588,000
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average period for recognition of unrecognized compensation cost     2 years 7 days    
Shares issued in period | shares     467,000    
Weighted average exercise price (in USD per share) | $ / shares     $ 61.27    
Unrecognized compensation cost from employee stock options     $ 27,444,000    
Share-Based Payment Arrangement, Option | Voluntary Seperation Program          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of grantees affected | grantees     52    
Voluntary seperation program expense     $ 2,532,000    
Voluntary seperation program reversal     $ 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     $ 92,852,000    
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 | shares     15,652,000    
Issuance of common stock under the employee stock purchase plan (in shares) | shares     12,397,000    
Employee stock purchase plan     $ 0 $ 0 $ 0