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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Global Wealth Platform [Member] | Dec. 31, 2012 Global Wealth Platform [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Noncontrolling Interest [Member] | Dec. 31, 2012 Equity Method Investee [Member] Minimum [Member] | Dec. 31, 2012 Equity Method Investee [Member] Maximum [Member] | Dec. 31, 2012 SEI-Sponsored Open-Ended Money Market Mutual Funds [Member] | Dec. 31, 2011 SEI-Sponsored Open-Ended Money Market Mutual Funds [Member] | Dec. 31, 2012 SEI Investments (Europe) Limited [Member] | Dec. 31, 2011 SEI Investments (Europe) Limited [Member] | Dec. 31, 2012 SEI Investments Distribution Co. (SIDCO) [Member] | Dec. 31, 2011 SEI Investments Distribution Co. (SIDCO) [Member] | Dec. 31, 2012 Building and Building Improvements [Member] Minimum [Member] | Dec. 31, 2012 Building and Building Improvements [Member] Maximum [Member] | Dec. 31, 2012 Computer Equipment [Member] Minimum [Member] | Dec. 31, 2012 Computer Equipment [Member] Maximum [Member] | Dec. 31, 2012 Furniture and Fixtures [Member] Minimum [Member] | Dec. 31, 2012 Furniture and Fixtures [Member] Maximum [Member]
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 50.00% |  | 20.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 452,247 | $ 420,986 | $ 496,292 | $ 590,877 |  |  |  |  |  |  |  | $ 247,314 | $ 281,760 |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 | 5,000 | 1,000 | 1,000 |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years | 39 years | 3 years | 5 years | 3 years | 5 years
Net book value of GWP |  |  |  |  | 304,271 | 304,271 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized software, accumulated amortization | 149,747 | 117,100 |  |  | 119,939 | 119,939 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized software development costs in-progress associated with future releases |  |  |  |  | 2,795 | 2,795 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Software | 31,004 | 40,954 | 38,729 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software Development Cost Useful Life |  |  |  |  |  | 15 years | 3 years | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Software Weighted Average Remaining Life | 9 years 6 months |  |  |  | 9 years 6 months | 9 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to capitalized software | 32,647 | 26,153 | 23,053 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated amortization for GWP abandoned components |  |  |  |  | 2,661 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Computer Software, Impairments | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Realized | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive employee stock options | 13,202,000 | 15,914,000 | 13,181,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount | $ 24.76 | $ 23.07 | $ 23.79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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