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v2.4.1.9

Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues | $ 322,757 us-gaap_Revenues | $ 322,047 us-gaap_Revenues | $ 318,815 us-gaap_Revenues | $ 302,386 us-gaap_Revenues | $ 299,024 us-gaap_Revenues | $ 280,655 us-gaap_Revenues | $ 274,574 us-gaap_Revenues | $ 271,879 us-gaap_Revenues | $ 1,266,005 us-gaap_Revenues | $ 1,126,132 us-gaap_Revenues | $ 992,522 us-gaap_Revenues
Income before income taxes | 115,525 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 128,618 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 128,854 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 116,665 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 101,063 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 93,986 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 129,387 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 110,962 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 489,662 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 435,398 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 329,496 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income attributable to SEI Investments Company | 77,097 us-gaap_NetIncomeLoss | 83,983 us-gaap_NetIncomeLoss | 82,813 us-gaap_NetIncomeLoss | 74,820 us-gaap_NetIncomeLoss | 65,515 us-gaap_NetIncomeLoss | 67,195 us-gaap_NetIncomeLoss | 83,494 us-gaap_NetIncomeLoss | 71,920 us-gaap_NetIncomeLoss | 318,713 us-gaap_NetIncomeLoss | 288,124 us-gaap_NetIncomeLoss | 206,848 us-gaap_NetIncomeLoss
Basic earnings per common share | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.44 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.48 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 1.89 us-gaap_EarningsPerShareBasic | $ 1.68 us-gaap_EarningsPerShareBasic | $ 1.19 us-gaap_EarningsPerShareBasic
Diluted earnings per common share | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.43 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 1.85 us-gaap_EarningsPerShareDiluted | $ 1.64 us-gaap_EarningsPerShareDiluted | $ 1.18 us-gaap_EarningsPerShareDiluted
Effective income tax rate | 33.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 28.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 33.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 36.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 5,582 us-gaap_GainOrLossOnSaleOfStockInSubsidiary | 22,112 us-gaap_GainOrLossOnSaleOfStockInSubsidiary | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary
Income (Loss) from extraordinary items, net of tax, per diluted share |  |  |  |  |  |  |  |  | $ 0.02 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare | $ 0.08 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare |
Gain on sale of subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of subsidiary | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 5,582 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | 22,112 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember |  |  |
Income (Loss) from extraordinary items, net of tax, per diluted share | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.02 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember | $ 0.08 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_SaleOfSubsidiaryGainLossMember |  |  |
Equity in earnings of unconsolidated affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Loss from impairment charge | 11,266 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember |  |  |  |  |  |  |
Income (Loss) from extraordinary items, net of tax, per diluted share | $ 0.06 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember |  |  |  |  |  |  |
Other income [Member] |  |  |  |  |  |  |  |  |  |  |
Settlement agreement |  |  |  |  | $ 0 us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0 us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 43,429 us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0 us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember |  |  |
Income (Loss) from extraordinary items, net of tax, per diluted share |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0.16 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember |  |  |

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