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Income Taxes (Components Of Net Income Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Domestic | $ 475,175 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 427,915 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 319,907 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | 14,487 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 7,042 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 8,046 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income Loss From Continuing Operations Before Income Taxes And Minority Interest | $ 489,662 seic_IncomeLossfromContinuingOperationsbeforeIncomeTaxesandMinorityInterest | $ 434,957 seic_IncomeLossfromContinuingOperationsbeforeIncomeTaxesandMinorityInterest | $ 327,953 seic_IncomeLossfromContinuingOperationsbeforeIncomeTaxesandMinorityInterest

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- Definition Income (Loss) from Continuing Operations before Income Taxes and Minority Interest + References No definition available. + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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