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v2.4.1.9

Investment In Unconsolidated Affiliates (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Oct. 31, 2012 | Apr. 17, 2015
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Distributions received from unconsolidated affiliate | $ 37,003 us-gaap_EquityMethodInvestmentDividendsOrDistributions | $ 31,505 us-gaap_EquityMethodInvestmentDividendsOrDistributions |  |
Company's share in the earnings of equity method investee | 34,033 us-gaap_IncomeLossFromEquityMethodInvestments | 31,891 us-gaap_IncomeLossFromEquityMethodInvestments |  |
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 |
Amount of purchase price financed through term loans |  |  | 69,930 us-gaap_LoansPayable / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember |
Financial Guarantee [Member] | L S V Asset Management [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  | 24,930 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LSVAssetManagementMember |
Financial Guarantee [Member] | LSV Employee Group III [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  | 45,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember |
Financial Guarantee [Member] | LSV Employee Group III [Member] | Subsequent Event [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  |  | 33,979 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount of guarantor's obligation, current carrying value |  |  |  | 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = seic_LsvEmployeeGroupIiiMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
L S V Asset Management [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Total investment in equity method investee | 50,282 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |  |
Distributions received from unconsolidated affiliate | 37,003 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember | 31,505 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |
Company's share in the earnings of equity method investee | $ 34,345 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember | $ 32,216 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember |  |
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 |  |  |

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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