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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 72,270	$ 50,235
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(5,307)	2,703
Unrealized holding loss on investments:
Unrealized holding gains during the period, net of income taxes	121	31
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(221)	(60)
Unrealized Gain (Loss) on Investments	(100)	(29)
Total other comprehensive income, net of tax	(5,407)	2,674
Comprehensive income	66,863	52,909
Comprehensive loss (income) attributable to the noncontrolling interest	101	(753)
Comprehensive income attributable to SEI Investments Company	$ 66,964	$ 52,156

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