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Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | $ 403,478 | $ 431,512 | $ 403,478 |
Less: Accumulated depreciation | (259,501) | (285,322) | (259,501) |
Property and Equipment, net | 143,977 | 146,190 | 143,977 |
Depreciation expense |  | 26,440 | 24,044 | $ 22,448
Loss on write off of purchased software related to the SEI Wealth Platform |  | 0 | (6,055) | $ 0
Buildings [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | 151,604 | 152,171 | 151,604 |
Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | 86,941 | 106,759 | 86,941 |
Land [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | 10,003 | 10,030 | 10,003 |
Purchased software [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | 122,433 | 128,008 | 122,433 |
Furniture and fixtures [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | 16,143 | 17,292 | 16,143 |
Leasehold improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | 15,393 | 15,175 | 15,393 |
Construction in progress [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, gross | $ 961 | $ 2,077 | $ 961 |
SEI Wealth Platform [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Income statement classification for purchased software write off related to the SEI Wealth Platform | Facilities, supplies and other costs |  |  |
SEI Wealth Platform [Member] | Property, Plant and Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on write off of purchased software related to the SEI Wealth Platform | $ 522 |  |  |
Private Banks [Member] | SEI Wealth Platform [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Segment classification for purchased software write off related to the SEI Wealth Platform | Private Banks |  |  |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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