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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounting Policies [Abstract]        
Net income $ 164,586 $ 154,900 $ 543,186 $ 425,420
Less: Net income attributable to non-controlling interests 382 0 382 0
Net income attributable to SEI Investments Company $ 164,204 $ 154,900 $ 542,804 $ 425,420
Shares used to compute basic earnings per common share (in shares) 123,099 129,418 124,710 130,550
Dilutive effect of stock awards (in shares) 3,226 1,253 2,974 1,280
Shares used to compute diluted earnings per common share (in shares) 126,325 130,671 127,684 131,830
Basic earnings per common share (in USD per share) $ 1.33 $ 1.20 $ 4.35 $ 3.26
Diluted earnings per common share (in USD per share) $ 1.30 $ 1.19 $ 4.25 $ 3.23