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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Revenues | $ 325,444 us-gaap_Revenues | $ 302,386 us-gaap_Revenues
Expenses | 219,015 us-gaap_OperatingCostsAndExpenses | 212,295 us-gaap_OperatingCostsAndExpenses
Operating profit (loss) | 106,429 us-gaap_GrossProfit | 90,091 us-gaap_GrossProfit
Gain on sale of subsidiary | 2,791 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 5,582 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Interest income | 180 us-gaap_InterestAndOtherIncome | 0 us-gaap_InterestAndOtherIncome
Total profit (loss) | 109,400 seic_TotalProfitLoss | 95,673 seic_TotalProfitLoss
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 111,213 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 105,179 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Expenses | 99,256 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 100,190 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Operating profit (loss) | 11,957 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 4,989 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Gain on sale of subsidiary | 2,791 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 5,582 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Interest income | 180 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Total profit (loss) | 14,928 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 10,571 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 74,015 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 66,424 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Expenses | 39,059 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 34,577 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Operating profit (loss) | 34,956 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 31,847 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Gain on sale of subsidiary | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Interest income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Total profit (loss) | 34,956 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 31,847 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 73,548 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 68,657 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Expenses | 35,211 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 34,095 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Operating profit (loss) | 38,337 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 34,562 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Gain on sale of subsidiary | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Interest income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Total profit (loss) | 38,337 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 34,562 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 65,367 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 61,008 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Expenses | 40,623 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 39,184 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Operating profit (loss) | 24,744 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 21,824 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Gain on sale of subsidiary | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Interest income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Total profit (loss) | 24,744 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 21,824 seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,301 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 1,118 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Expenses | 4,866 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 4,249 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Operating profit (loss) | (3,565)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | (3,131)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Gain on sale of subsidiary | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Interest income | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 0 us-gaap_InterestAndOtherIncome / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Total profit (loss) | $ (3,565)seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | $ (3,131)seic_TotalProfitLoss / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember

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