Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Asset management, administration and distribution fees	$ 246,768	$ 225,071
Information processing and software servicing fees	70,653	69,178
Transaction-based and trade execution fees	8,023	8,137
Total revenues	325,444us-gaap_Revenues	302,386us-gaap_Revenues
Expenses:
Subadvisory, distribution and other asset management costs	38,517	34,012
Software royalties and other information processing costs	7,509	8,553
Brokerage commissions	5,972seic_BrokerageCommissions	5,979seic_BrokerageCommissions
Compensation, benefits and other personnel	94,186	94,424
Stock-based compensation	3,750	2,823
Consulting, outsourcing and professional fees	35,628us-gaap_ProfessionalFees	34,933us-gaap_ProfessionalFees
Data processing and computer related	13,400	12,620
Facilities, supplies and other costs	17,059us-gaap_OccupancyNet	15,852us-gaap_OccupancyNet
Amortization	10,358us-gaap_AmortizationOfIntangibleAssets	9,214us-gaap_AmortizationOfIntangibleAssets
Depreciation	5,995us-gaap_DepreciationNonproduction	5,584us-gaap_DepreciationNonproduction
Total expenses	232,374us-gaap_CostsAndExpenses	223,994us-gaap_CostsAndExpenses
Income from operations	93,070us-gaap_OperatingIncomeLoss	78,392us-gaap_OperatingIncomeLoss
Net gain from investments	250us-gaap_GainLossOnInvestments	136us-gaap_GainLossOnInvestments
Interest and dividend income	969	777
Interest expense	(113)us-gaap_InterestExpense	(113)us-gaap_InterestExpense
Equity in earnings of unconsolidated affiliates	34,033	31,891
Gain on sale of subsidiary	2,791	5,582
Income before income taxes	131,000	116,665
Income taxes	46,389us-gaap_IncomeTaxExpenseBenefit	41,845us-gaap_IncomeTaxExpenseBenefit
Net income	$ 84,611us-gaap_ProfitLoss	$ 74,820us-gaap_ProfitLoss
Basic earnings per common share	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic
Shares used to compute basic earnings per share	166,695	169,306
Diluted earnings per common share	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.43us-gaap_EarningsPerShareDiluted
Shares used to compute diluted earnings per share	170,703	173,828

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Sub-advisory fees for mutual funds. Sub-advisory fees that the fund's adviser pays for out of the management fee, which it receives from the fund. Also includes distribution fees paid to brokers and other related investment management costs associated with the company's other types of investment products.

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-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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