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Variable Interest Entities - Investment Products (Details) | 9 Months Ended
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Sep. 30, 2015
Variable Interest Entities - Investment Products [Abstract] |
Percentage not approached by expected return on any VIE investment | 50.00%

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- Definition Variable Interest Entities, Investment Objective Threshold Percentage + References No definition available. + Details
Name: | seic_VariableInterestEntitiesInvestmentObjectiveThresholdPercentage
Namespace Prefix: | seic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable interest entities investment products. + References No definition available. + Details
Name: | seic_VariableInterestEntitiesInvestmentProductsAbstract
Namespace Prefix: | seic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration