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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Software Development [Member] | Dec. 31, 2012 Software Development [Member] | Dec. 31, 2011 Software Development [Member] | Dec. 31, 2013 SEI Wealth Platform [Member] | Dec. 31, 2012 SEI Wealth Platform [Member] | Dec. 31, 2011 SEI Wealth Platform [Member] | Dec. 31, 2012 SEI Wealth Platform [Member] Amortization [Member] | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Sei Investments Europe Limited [Member] | Dec. 31, 2012 Sei Investments Europe Limited [Member] | Dec. 31, 2013 Sei Investments Distribution Co Sidco [Member] | Dec. 31, 2012 Sei Investments Distribution Co Sidco [Member] | Dec. 31, 2013 Minimum [Member] Software Development [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Software Development [Member] | Dec. 31, 2013 Weighted Average [Member] Software Development [Member] | Dec. 31, 2013 Weighted Average [Member] SEI Wealth Platform [Member] | Dec. 31, 2013 Building and Building Improvements [Member] Minimum [Member] | Dec. 31, 2013 Building and Building Improvements [Member] Maximum [Member] | Dec. 31, 2013 Computer Equipment [Member] Minimum [Member] | Dec. 31, 2013 Computer Equipment [Member] Maximum [Member] | Dec. 31, 2013 Furniture and Fixtures [Member] Minimum [Member] | Dec. 31, 2013 Furniture and Fixtures [Member] Maximum [Member] | Mar. 28, 2013 SEI Asset Korea Co., Ltd. [Member] | Dec. 31, 2013 SEI Asset Korea Co., Ltd. [Member] | Apr. 30, 2013 LSV Asset Management [Member] | Dec. 31, 2011 LSV Asset Management [Member] | Dec. 31, 2013 Equity Method Investee [Member] Minimum [Member] | Dec. 31, 2013 Equity Method Investee [Member] Maximum [Member]
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership before sale of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56.10% |  |  |  |  |
Closing date, sale of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 28, 2013 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 39.30% | 41.20% | 20.00% | 50.00%
Cash and cash equivalents | $ 578,273 | $ 452,247 | $ 420,986 | $ 496,292 |  |  |  |  |  |  |  | $ 387,201 | $ 247,314 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 | 5,000 | 500 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years | 39 years | 3 years | 5 years | 3 years | 5 years |  |  |  |  |  |
Net book value of the Platform | 312,615 | 307,490 |  |  |  |  |  | 309,725 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized software, accumulated amortization | 180,062 | 149,747 |  |  |  |  |  | 149,924 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized software development costs in-progress associated with future releases |  |  |  |  |  |  |  | 2,796 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions to capitalized software | (39,500) | (31,004) | (40,954) |  |  |  |  | (8,812) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  | 3 years |  | 15 years | 8 years 6 months | 8 years 6 months |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to capitalized software |  |  |  |  | 34,375 | 32,647 | 26,153 | 34,045 | 32,177 | 25,610 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized computer software impairments |  |  |  |  |  |  |  |  |  |  | $ 2,661 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive employee stock options | 7,736 | 13,202 | 15,914 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount | $ 30.54 | $ 24.76 | $ 23.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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