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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 164,586 $ 154,900 $ 543,186 $ 425,420
Other comprehensive (loss) income, net of tax:        
Foreign currency translation adjustments (3,855) 12,413 18,038 9,071
Unrealized gain (loss) on investments:        
Unrealized gains (losses) during the period, net of income taxes of $(276), $(1,007), $(1,410) and $(463) 924 3,373 4,731 1,546
Reclassification adjustment for gains realized in net income, net of income taxes of $18, $21, $49 and $76 (64) (70) (172) (251)
Total other comprehensive (loss) income, net of tax (2,995) 15,716 22,597 10,366
Comprehensive income 161,591 170,616 565,783 435,786
Less: Comprehensive income attributable to the non-controlling interests 382 0 382 0
Comprehensive income attributable to SEI Investments Company $ 161,209 $ 170,616 $ 565,401 $ 435,786