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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 331,655	$ 318,713	$ 288,474
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(14,900)	(10,189)	(3,760)
Unrealized holding (loss) gain on investments:
Unrealized holding (losses) gains during the period, net of income taxes of $822, $(592) and $(954)	(1,659)	441	(1,149)
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(76), $319 and $170	164	(634)	(294)
Total other comprehensive loss, net of taxes	(16,395)	(10,382)	(5,203)
Comprehensive income	315,260	308,331	283,271
Less: Comprehensive loss attributable to noncontrolling interest	0	0	101
Comprehensive income attributable to SEI Investments	$ 315,260	$ 308,331	$ 283,372

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