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Investment In Unconsolidated Affiliates (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2011 | Oct. 31, 2012 | Jan. 30, 2015
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Company's share in the earnings (losses) of equity method investee | $ 127,786 us-gaap_IncomeLossFromEquityMethodInvestments | $ 118,076 us-gaap_IncomeLossFromEquityMethodInvestments | $ 98,671 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |  |
Distributions received from unconsolidated affiliate | 137,866 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 137,104 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 92,227 us-gaap_EquityMethodInvestmentDividendsOrDistributions |  |  |  |  |
Payments for ownership interest in Gao Fu | 2,000 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 2,604 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 3,819 us-gaap_PaymentsForProceedsFromOtherInvestingActivities |  |  |  |  |
LSV Employee Group II [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Purchase price of partnership interest |  |  |  |  |  | 4,300 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiMember |  |
LSV Employee Group III [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Purchase of partnership interest value |  |  |  |  |  |  | 77,700 seic_PurchaseOfPartnershipInterestValue / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember |
Loans payable |  |  |  |  |  |  | 69,930 us-gaap_LoansPayable / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember |
Financial Guarantee [Member] | LSV Employee Group II [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  | 3,655 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiMember |  |
Financial Guarantee [Member] | LSV Employee Group III [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  | 45,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember |
Guarantor obligations, term | 5 years |  |  |  |  |  |  |
Financial Guarantee [Member] | LSV Employee Group III [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  | 38,658 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Guarantor obligations, current carrying value |  |  |  |  |  |  |  | 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Financial Guarantee [Member] | LSV Asset Management [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  | 24,930 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LSVAssetManagementMember |
LSV Asset Management [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 39.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  | 39.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  |  |
Total investment in equity method investee | 52,940 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  | 52,940 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  |  |
Company's share in the earnings (losses) of equity method investee | 140,211 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember | 118,983 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember | 99,989 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  |  |  |
Distributions received from unconsolidated affiliate | 137,866 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember | 137,104 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember | 92,227 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  |  |  |
Gao Fu [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 27.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember |  |  | 27.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember |  |  |  |
Company's share in the earnings (losses) of equity method investee | (1,159)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember | (907)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember | (1,318)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember |  |  |  |  |
Payments for ownership interest in Gao Fu | 3,000 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember |  |  |  | 13,000 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember |  |  |
Loss from impairment charge |  |  |  | $ (11,266)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_GaoFuMember |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |

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