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Investment In Unconsolidated Affiliates (Condensed Balance Sheets of LSV) (Details) (LSV Asset Management [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
LSV Asset Management [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Current Assets	$ 133,657us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember	$ 118,630us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember
Equity Method Investment, Summarized Financial Information, Noncurrent Assets	2,269us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember	2,588us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember
Equity Method Investment, Summarized Financial Information, Assets	135,926us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember	121,218us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember
Equity Method Investment, Summarized Financial Information, Current Liabilities	35,208us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember	26,103us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember
Equity Method Investment Summarized Financial Information, Equity	100,718us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember	95,115us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$ 135,926us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember	$ 121,218us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seic_LSVAssetManagementMember

X

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The amount of assets reported by an equity method investment of the entity.

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