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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 | $ 5,582 us-gaap_GainOrLossOnSaleOfStockInSubsidiary | $ 22,112 us-gaap_GainOrLossOnSaleOfStockInSubsidiary | $ 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary |
Gain on sale of subsidiary, diluted earnings per share impact, net | $ 0.02 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare | $ 0.08 us-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 |  |  |  | 11,220 seic_DisposalGroupProceedsFromSaleContingentPurchaseAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember
Revenues and Net Income Included on Company's Consolidated Statement of Operations |  |  |  |
Revenues |  | 11,514 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember |  | 2,889 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember
Net income |  | 2,703 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember |  | 796 us-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 |  | $ 1,517 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember |  | $ 446 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seic_SeiAssetKoreaCoLtdMember

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