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v2.4.1.9

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

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