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Business Segment Information (Schedule Of Additional Information Pertaining To 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] |  |
Capital Expenditures | $ 15,375 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 17,035 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Depreciation | 5,995 us-gaap_Depreciation | 5,584 us-gaap_Depreciation
Amortization | 10,358 us-gaap_AdjustmentForAmortization | 9,214 us-gaap_AdjustmentForAmortization
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 8,502 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 8,798 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Depreciation | 3,097 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 3,732 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Amortization | 7,251 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 5,952 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 3,318 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 3,589 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Depreciation | 838 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 491 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Amortization | 2,400 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 2,197 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 947 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 1,288 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Depreciation | 303 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 209 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Amortization | 375 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 341 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 2,048 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 2,135 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Depreciation | 999 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 512 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Amortization | 250 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 227 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 151 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 580 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Depreciation | 563 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 530 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Amortization | 25 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 440 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Total From Business Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 14,966 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 16,390 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember
Depreciation | 5,800 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 5,474 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember
Amortization | 10,301 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 9,157 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember
Corporate Overhead [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 409 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 645 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Depreciation | 195 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 110 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Amortization | $ 57 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ 57 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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