Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $) In Thousands, unless otherwise specified
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3 Months Ended |
12 Months Ended |
Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Segment Reporting Information [Line Items] |
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Revenues |
$ 322,757us-gaap_Revenues |
$ 322,047us-gaap_Revenues |
$ 318,815us-gaap_Revenues |
$ 302,386us-gaap_Revenues |
$ 299,024us-gaap_Revenues |
$ 280,655us-gaap_Revenues |
$ 274,574us-gaap_Revenues |
$ 271,879us-gaap_Revenues |
$ 1,266,005us-gaap_Revenues |
$ 1,126,132us-gaap_Revenues |
$ 992,522us-gaap_Revenues |
Expenses |
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864,332us-gaap_OperatingCostsAndExpenses |
824,279us-gaap_OperatingCostsAndExpenses |
736,172us-gaap_OperatingCostsAndExpenses |
Operating profit (loss) |
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401,673us-gaap_GrossProfit |
301,853us-gaap_GrossProfit |
256,350us-gaap_GrossProfit |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |
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5,582us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal |
22,112us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal |
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Total Profit (Loss) |
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407,255seic_TotalProfitLoss |
323,965seic_TotalProfitLoss |
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Private Banks [Member] |
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Segment Reporting Information [Line Items] |
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Revenues |
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441,467us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
397,138us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
364,788us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
Expenses |
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399,620us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
392,399us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
357,001us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
Operating profit (loss) |
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41,847us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
4,739us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
7,787us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |
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5,582us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
22,112us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
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Total Profit (Loss) |
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47,429seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
26,851seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
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Investment Advisors [Member] |
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Segment Reporting Information [Line Items] |
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Revenues |
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283,811us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
241,252us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
202,703us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
Expenses |
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146,500us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
133,962us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
120,146us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
Operating profit (loss) |
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137,311us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
107,290us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
82,557us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |
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0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
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Total Profit (Loss) |
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137,311seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
107,290seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
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Institutional Investors [Member] |
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Segment Reporting Information [Line Items] |
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Revenues |
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284,677us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
257,658us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
227,889us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
Expenses |
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140,659us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
133,218us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
116,546us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
Operating profit (loss) |
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144,018us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
124,440us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
111,343us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |
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0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
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Total Profit (Loss) |
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144,018seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
124,440seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
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Investment Managers [Member] |
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Segment Reporting Information [Line Items] |
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Revenues |
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251,310us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
226,081us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
193,484us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
Expenses |
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159,176us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
148,977us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
127,525us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
Operating profit (loss) |
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92,134us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
77,104us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
65,959us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |
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0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
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Total Profit (Loss) |
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92,134seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
77,104seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
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Investments In New Businesses [Member] |
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Segment Reporting Information [Line Items] |
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Revenues |
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4,740us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
4,003us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
3,658us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
Expenses |
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18,377us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
15,723us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
14,954us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
Operating profit (loss) |
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(13,637)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
(11,720)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
(11,296)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |
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0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
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Total Profit (Loss) |
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$ (13,637)seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
$ (11,720)seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
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