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Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | $ 401,135 |  | $ 401,135 |  | $ 366,830
Less: Accumulated depreciation | (258,783) |  | (258,783) |  | (241,295)
Property and Equipment, net | 142,352 |  | 142,352 |  | 125,535
Depreciation expense | 6,108 | $ 5,579 | 17,946 | $ 16,494 |
Loss on write off of purchased software related to the SEI Wealth Platform |  |  | (6,055) | $ 0 |
Building [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | 151,037 |  | 151,037 |  | 149,890
Equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | 87,684 |  | 87,684 |  | 78,266
Land [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | 10,003 |  | 10,003 |  | 9,997
Purchased Software [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | 122,295 |  | 122,295 |  | 104,964
Furniture and Fixtures [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | 16,932 |  | 16,932 |  | 16,944
Leasehold Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | 11,996 |  | 11,996 |  | 5,675
Construction in Progress [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, gross | $ 1,188 |  | $ 1,188 |  | $ 1,094
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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