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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 83,983	$ 67,195	$ 241,616	$ 222,959
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(6,308)	3,146	(4,896)	(3,961)
Unrealized (loss) gain on investments:
Unrealized (losses) gains during the period, net of income taxes of $330, $111, $(426) and $(701)	(584)	354	407	(886)
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(39), $23, $(1) and $(162)	76	55	7	(287)
Unrealized (loss) gain on investments:	(508)	409	414	(1,173)
Total other comprehensive (loss) income, net of tax	(6,816)	3,555	(4,482)	(5,134)
Comprehensive income	77,167	70,750	237,134	217,825
Comprehensive loss attributable to the noncontrolling interest	0	0	0	101
Comprehensive income attributable to SEI Investments Company	$ 77,167	$ 70,750	$ 237,134	$ 217,926

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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