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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
	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	$ 322,757us-gaap_Revenues	$ 322,047us-gaap_Revenues	$ 318,815us-gaap_Revenues	$ 302,386us-gaap_Revenues	$ 299,024us-gaap_Revenues	$ 280,655us-gaap_Revenues	$ 274,574us-gaap_Revenues	$ 271,879us-gaap_Revenues	$ 1,266,005us-gaap_Revenues	$ 1,126,132us-gaap_Revenues	$ 992,522us-gaap_Revenues
Assets	1,542,875us-gaap_Assets				1,439,169us-gaap_Assets				1,542,875us-gaap_Assets	1,439,169us-gaap_Assets
United States [Member]
Revenues									1,063,223us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	962,266us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	843,407us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Assets	1,315,036us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US				1,231,565us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US				1,315,036us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US	1,231,565us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
International Operations [Member]
Revenues									202,782us-gaap_Revenues / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember	163,866us-gaap_Revenues / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember	149,115us-gaap_Revenues / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember
Assets	$ 227,839us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember				$ 207,604us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember				$ 227,839us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember	$ 207,604us-gaap_Assets / us-gaap_StatementGeographicalAxis = seic_InternationalOperationsMember

X

- 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

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-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

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-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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X

- 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

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-Article 5

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