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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Cash and cash equivalents invested in SEI-sponsored money market funds | $ 532,167 | $ 487,059 | $ 532,167 | $ 487,059 | $ 578,273 | $ 452,247
Restricted cash | 5,500 |  | 5,500 |  | 5,500 |
Net book value of the SEI Wealth Platform | 312,193 |  | 312,193 |  | 312,615 |
Anti-dilutive employee stock options | 5,397,000 | 5,548,000 | 5,397,000 | 6,745,000 |  |
Antidilutive securities excluded from computation of net income, per outstanding unit, amount | $ 32.40 | $ 29.22 | $ 32.40 | $ 28.01 |  |
SEI Investments Distribution Co. (SIDCO) [Member] |  |  |  |  |  |
Restricted cash | 500 |  | 500 |  | 500 |
SEI Investments (Europe) Limited [Member] |  |  |  |  |  |
Restricted cash | 5,000 |  | 5,000 |  | 5,000 |
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member] |  |  |  |  |  |
Cash and cash equivalents invested in SEI-sponsored money market funds | 328,014 |  | 328,014 |  | 387,201 |
SEI Wealth Platform [Member] |  |  |  |  |  |
Capitalized software development costs related to the SEI Wealth Platform |  |  | 18,262 | 22,186 |  |
One-time contractual payment for conversion option included in software development costs |  |  |  | 8,812 |  |
Net book value of the SEI Wealth Platform | 312,193 |  | 312,193 |  |  |
Capitalized software development costs in-progress associated with future releases | 8,854 |  | 8,854 |  |  |
Estimated useful life of the SEI Wealth Platform | 15 years |  |  |  |  |
Amortization expense related to the SEI Wealth Platform |  |  | $ 18,589 | $ 16,321 |  |
Weighted Average [Member] | SEI Wealth Platform [Member] |  |  |  |  |  |
Estimated useful life of the SEI Wealth Platform | 8 years |  |  |  |  |

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