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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 63,346 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 55,851 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 54,074 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Depreciation | 22,448 us-gaap_Depreciation | 22,497 us-gaap_Depreciation | 22,586 us-gaap_Depreciation
Amortization | 38,679 us-gaap_AdjustmentForAmortization | 34,602 us-gaap_AdjustmentForAmortization | 33,258 us-gaap_AdjustmentForAmortization
Assets | 1,542,875 us-gaap_Assets | 1,439,169 us-gaap_Assets |
Private Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 30,883 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 34,258 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 32,509 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Depreciation | 13,393 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 15,506 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 15,226 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Amortization | 24,993 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 22,379 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 22,218 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember
Assets | 417,890 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember | 430,613 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_PrivateBankMember |
Investment Advisors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 13,783 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 12,611 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 11,193 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Depreciation | 2,507 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 2,091 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 1,981 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Amortization | 9,228 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 8,234 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 7,167 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember
Assets | 134,371 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember | 124,028 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentAdvisorsMember |
Institutional Investors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 4,575 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 2,712 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 2,781 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Depreciation | 1,041 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 893 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 1,012 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Amortization | 1,430 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 1,274 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 1,208 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember
Assets | 118,397 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember | 97,816 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InstitutionalInvestorsMember |
Investment Managers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 9,505 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 4,871 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 5,494 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Depreciation | 2,917 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 1,970 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 1,914 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Amortization | 954 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 851 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 804 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember
Assets | 134,614 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember | 122,969 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentManagersMember |
Investments In New Businesses [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 2,547 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 639 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 632 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Depreciation | 1,983 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 1,589 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 1,716 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Amortization | 1,846 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 1,636 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 1,249 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember
Assets | 21,830 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember | 6,064 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_InvestmentsInNewBusinessesMember |
Total From Business Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 61,293 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 55,091 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 52,609 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember
Depreciation | 21,841 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 22,049 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 21,849 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember
Amortization | 38,451 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 34,374 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 32,646 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember
Assets | 827,102 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember | 781,490 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = seic_TotalFromBusinessSegmentsMember |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 2,053 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 760 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 1,465 us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Depreciation | 607 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 448 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 737 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Amortization | 228 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 228 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 612 us-gaap_AdjustmentForAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Assets | $ 715,773 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ 657,679 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember |

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