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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

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