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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Data [Abstract]                      
Revenues $ 368,810 $ 354,641 $ 343,831 $ 334,263 $ 335,397 $ 335,622 $ 337,745 $ 325,444 $ 1,401,545 $ 1,334,208 $ 1,266,005
Income before income taxes 133,053 130,890 124,904 119,638 115,082 120,588 133,810 131,000 $ 508,485 $ 500,480 $ 489,662
Net income $ 88,611 $ 86,704 $ 81,005 $ 77,497 $ 81,379 $ 79,425 $ 86,240 $ 84,611      
Basic earnings per common share $ 0.55 $ 0.54 $ 0.50 $ 0.48 $ 0.49 $ 0.48 $ 0.52 $ 0.51 $ 2.07 $ 2.00 $ 1.89
Diluted earnings per common share $ 0.55 $ 0.53 $ 0.49 $ 0.47 $ 0.48 $ 0.47 $ 0.51 $ 0.50 $ 2.03 $ 1.96 $ 1.85
Effective income tax rate 33.40% 33.80% 35.20% 35.20% 29.30% 34.10% 35.60% 35.40% 34.30% 33.70% 34.90%
Extraordinary Item [Member]                      
Extraordinary Item [Line Items]                      
Performance fee associated with SEI-sponsored investment product $ 12,286                    
Sub-advisory expense associated with SEI-sponsored investment product 6,143                    
Profit from extraordinary item, net of tax $ 4,091                    
Profit from extraordinary item, net of tax, per diluted share $ 0.03