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Related Party Transactions (Details) (RICs [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
RICs [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Investment Advisory and Administration Fees | $ 489,066 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember | $ 422,825 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember | $ 380,645 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember
Distribution and Servicing Fees | 66,424 us-gaap_DistributionAndServicingFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember | 47,988 us-gaap_DistributionAndServicingFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember | 37,827 us-gaap_DistributionAndServicingFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember
Brokerage commissions revenue | $ 1,733 us-gaap_BrokerageCommissionsRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember | $ 620 us-gaap_BrokerageCommissionsRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember | $ 1,213 us-gaap_BrokerageCommissionsRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = seic_RegulatedInvestmentCompaniesMember

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- Definition Amount of commission revenue from buying and selling securities on behalf of customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 05 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35709949&loc=d3e40544-110947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(b)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of fees from providing distribution and shareholder services. Distribution services include, but are not limited to, marketing and selling fund shares, advertising, printing and mailing of prospectuses and sales literature to investors. Shareholder services include, but are not limited to, answering shareholder inquiries and providing shareholders with investment information. + References No definition available. + Details
Name: | us-gaap_DistributionAndServicingFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InvestmentAdvisoryFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration