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v2.4.1.9

Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Undistributed earnings of foreign subsidiaries | $ 61,833 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Unrecognized tax benefit, excluding interest and penalties | 14,018 us-gaap_UnrecognizedTaxBenefits | 12,028 us-gaap_UnrecognizedTaxBenefits | 11,553 us-gaap_UnrecognizedTaxBenefits | 9,410 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would affect effective tax rate | 12,162 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Amount included in Other long-term liabilities | 10,327 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | 8,607 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |
Amount of previously unrecognized tax benefits recognized | 1,336 seic_UnrecognizedTaxBenefitsReductionsResultingFromLapseofApplicableStatuteofLimitations1 |  |  |
Tax related interest and penalties | 1,066 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 754 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 770 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |
Current liabilities [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Amount netted against current payable account | 4,757 us-gaap_LiabilityForUncertainTaxPositionsCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember |  |  |
Other long-term liabilities [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Amount included in Other long-term liabilities | 10,327 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |  |  |
Settlement and Lapse of Statute [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized tax benefits within the next 12 months | $ 1,700 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = seic_SettlementandLapseofStatuteMember |  |  |

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- Definition Unrecognized Tax Benefits Reductions Resulting From Lapse of Applicable Statute of Limitations1 + References No definition available. + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The current portion of the amount recognized for uncertain tax positions as of the balance sheet date. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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