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Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended			3 Months Ended								1 Months Ended	3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Gain on sale of subsidiary [Member]	Sep. 30, 2013 Gain on sale of subsidiary [Member]	Jun. 30, 2013 Gain on sale of subsidiary [Member]	Mar. 31, 2013 Gain on sale of subsidiary [Member]	Dec. 31, 2013 Settlement agreement [Member]	Sep. 30, 2013 Settlement agreement [Member]	Jun. 30, 2013 Settlement agreement [Member]	Mar. 31, 2013 Settlement agreement [Member]	Nov. 30, 2012 SIV Securities [Member]	Dec. 31, 2012 SIV Securities [Member]	Sep. 30, 2012 SIV Securities [Member]	Jun. 30, 2012 SIV Securities [Member]	Mar. 31, 2012 SIV Securities [Member]
Revenues	$ 299,024	$ 280,655	$ 274,574	$ 271,879	$ 261,635	$ 251,752	$ 241,237	$ 237,898	$ 1,126,132	$ 992,522	$ 929,727
Income before income taxes	101,063	93,986	129,387	110,962	87,544	83,501	78,501	79,950	435,398	329,496	318,487
Net income attributable to SEI Investments Company	65,515	67,195	83,494	71,920	56,585	50,743	49,555	49,965	288,124	206,848	204,959
Basic earnings per common share	$ 0.39	$ 0.39	$ 0.48	$ 0.42	$ 0.33	$ 0.29	$ 0.28	$ 0.28	$ 1.68	$ 1.19	$ 1.12
Diluted earnings per common share	$ 0.37	$ 0.38	$ 0.47	$ 0.41	$ 0.32	$ 0.29	$ 0.28	$ 0.28	$ 1.64	$ 1.18	$ 1.11										$ 0.02	$ 0.01	$ 0.00	$ 0.01
Effective income tax rate	35.20%	28.50%	35.50%	34.90%	35.00%	39.00%	36.60%	37.20%	33.70%	36.90%	35.20%
Gain on sale of subsidiary (Note 15)									22,112	0	0	0	0	0	22,112
Settlement agreement (Note 16)																0	0	43,429	0
Total SIV-related gains																				$ 5,322	$ 5,897	$ 3,389	$ 1,072	$ 2,882
Income (Loss) from Extraordinary Items, Net of Tax, Per Diluted Share				$ 0.08								$ 0.00	$ 0.00	$ 0.00	$ 0.08	$ 0.00	$ 0.00	$ 0.16	$ 0.00

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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