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Business Segment Information (Schedule of Revenues And Assets Based On Location) (Details) (USD $) In Thousands, 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
Assets | 1,542,875 us-gaap_Assets |  |  |  | 1,439,169 us-gaap_Assets |  |  |  | 1,542,875 us-gaap_Assets | 1,439,169 us-gaap_Assets |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,063,223 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 962,266 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 843,407 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Assets | 1,315,036 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 1,231,565 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 1,315,036 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 1,231,565 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US |
International Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 202,782 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember | 163,866 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember | 149,115 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember
Assets | $ 227,839 us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember |  |  |  | $ 207,604 us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember |  |  |  | $ 227,839 us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember | $ 207,604 us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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