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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 288,474	$ 208,034	$ 206,650
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments	(3,760)	5,904	(3,195)
Unrealized holding (loss) gain on investments:
Unrealized holding (losses) gains during the period, net of income taxes of $(954), $86 and $811	(1,149)	341	1,369
Less: reclassification adjustment for gains realized in net income, net of income taxes of $170, $50 and $77	(294)	(86)	(134)
Total other comprehensive (loss) gain, net of taxes	(5,203)	6,159	(1,960)
Comprehensive income	283,271	214,193	204,690
Less: Comprehensive loss (income) attributable to noncontrolling interest	101	(3,006)	(988)
Comprehensive income attributable to SEI Investments	$ 283,372	$ 211,187	$ 203,702

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