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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues $ 335,397 $ 335,622 $ 337,745 $ 325,444 $ 322,757 $ 322,047 $ 318,815 $ 302,386 $ 1,334,208 $ 1,266,005 $ 1,126,132
Income before income taxes 115,082 120,588 133,810 131,000 115,525 128,618 128,854 116,665 500,480 489,662 435,398
Net income attributable to SEI Investments Company $ 81,379 $ 79,425 $ 86,240 $ 84,611 $ 77,097 $ 83,983 $ 82,813 $ 74,820 $ 331,655 $ 318,713 $ 288,124
Basic earnings per common share $ 0.49 $ 0.48 $ 0.52 $ 0.51 $ 0.46 $ 0.50 $ 0.49 $ 0.44 $ 2.00 $ 1.89 $ 1.68
Diluted earnings per common share $ 0.48 $ 0.47 $ 0.51 $ 0.50 $ 0.45 $ 0.49 $ 0.48 $ 0.43 $ 1.96 $ 1.85 $ 1.64
Effective income tax rate 29.30% 34.10% 35.60% 35.40% 33.30% 34.70% 35.70% 35.90% 33.70% 34.90% 33.70%
Gain on sale of subsidiary                 $ 2,791 $ 5,582 $ 22,112
Income (Loss) from extraordinary items, net of tax, per diluted share                 $ 0.01 $ 0.02 $ 0.08
Gain on sale of subsidiary [Member]                      
Gain on sale of subsidiary $ 0 $ 0 $ 0 $ 2,791 $ 0 $ 0 $ 0 $ 5,582      
Income (Loss) from extraordinary items, net of tax, per diluted share $ 0.00 $ 0.00 $ 0.00 $ 0.01 $ 0.00 $ 0.00 $ 0.00 $ 0.02      
Equity in earnings of unconsolidated affiliates [Member]                      
Loss from impairment charge         $ 11,266 $ 0 $ 0 $ 0      
Income (Loss) from extraordinary items, net of tax, per diluted share         $ 0.06 $ 0.00 $ 0.00 $ 0.00