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Income Taxes (Unrecognized Tax Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 12,028us-gaap_UnrecognizedTaxBenefits	$ 11,553us-gaap_UnrecognizedTaxBenefits	$ 9,410us-gaap_UnrecognizedTaxBenefits
Gross additions, current year	1,957us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1,834us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2,196us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Gross reductions, current year	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions
Tax positions related to current year	1,957seic_UnrecognizedTaxBenefitsDecreasesandIncreasesResultingfromCurrentPeriodTaxPositions	1,834seic_UnrecognizedTaxBenefitsDecreasesandIncreasesResultingfromCurrentPeriodTaxPositions	2,196seic_UnrecognizedTaxBenefitsDecreasesandIncreasesResultingfromCurrentPeriodTaxPositions
Gross additions, prior year	1,369us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3,435us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1,990us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross reductions, prior year	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Tax positions related to prior years tax positions	1,369seic_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions	3,435seic_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions	1,990seic_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions
Settlements	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(3,772)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(99)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Lapses on statute of limitations	(1,336)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(1,022)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(1,944)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized tax benefits, Ending Balance	$ 14,018us-gaap_UnrecognizedTaxBenefits	$ 12,028us-gaap_UnrecognizedTaxBenefits	$ 11,553us-gaap_UnrecognizedTaxBenefits

X

- Definition

Unrecognized tax benefits decreases and increases resulting from current period tax positions.

+ References

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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