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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 545,552	$ 452,099	$ 578,273	$ 452,247
Additions to capitalized software	(9,408)	(6,048)
Net book value of the Platform	312,866		312,615
Capitalized software, accumulated amortization	189,219		180,062
Anti-dilutive employee stock options	4,389,000	6,863,000
Antidilutive securities excluded from computation of net income, per outstanding unit, amount	$ 32.40	$ 28.05
SEI Investments Distribution Co. (SIDCO) [Member]
Restricted cash	500		500
SEI Investments (Europe) Limited [Member]
Restricted cash	5,000		5,000
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents	368,882		387,201
Software Development [Member]
Amortization expense related to capitalized software	9,157	8,186
SEI Wealth Platform [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Amortization expense related to capitalized software	9,110	8,068
Net book value of the Platform	312,819
Capitalized software, accumulated amortization	159,034
Capitalized software development costs in-progress associated with future releases	$ 12,204
Weighted Average [Member] | Software Development [Member]
Finite-Lived Intangible Asset, Useful Life		8 years 3 months
Weighted Average [Member] | SEI Wealth Platform [Member]
Finite-Lived Intangible Asset, Useful Life		8 years 3 months

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