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Sale of SEI Asset Korea (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary	$ 5,582us-gaap_GainOrLossOnSaleOfStockInSubsidiary	$ 22,112us-gaap_GainOrLossOnSaleOfStockInSubsidiary	$ 0us-gaap_GainOrLossOnSaleOfStockInSubsidiary
Gain on sale of subsidiary, diluted earnings per share impact, net	$ 0.02us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare	$ 0.08us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Closing date, sale of subsidiary	Mar. 28, 2013
Contingent purchase price from sale of SEI AK				11,220seic_DisposalGroupProceedsFromSaleContingentPurchaseAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember
Revenues and Net Income Included on Company's Consolidated Statement of Operations
Revenues		11,514us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember		2,889us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember
Net income		2,703us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember		796us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember
Less: Income attributable to the noncontrolling interests		(1,186)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember		(350)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember
Net income attributable to SEI AK		$ 1,517us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember		$ 446us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember

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