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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Cash and cash equivalents invested in SEI-sponsored money market funds | $ 577,914 | $ 527,214 | $ 577,914 | $ 527,214 | $ 578,273 | $ 452,247
Restricted cash | 5,500 |  | 5,500 |  | 5,500 |
Net book value of the SEI Wealth Platform | 310,368 |  | 310,368 |  | 312,615 |
Anti-dilutive employee stock options | 4,411 | 3,042 | 4,416 | 5,522 |  |
Antidilutive securities excluded from computation of net income, per outstanding unit, amount | $ 32.38 | $ 31.39 | $ 32.37 | $ 29.22 |  |
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 | 374,292 |  | 374,292 |  | 387,201 |
SEI Wealth Platform [Member] |  |  |  |  |  |
Capitalized software development costs related to the SEI Wealth Platform |  |  | 26,193 | 31,044 |  |
One-time contractual payment for conversion option included in software development costs |  |  |  | 8,812 |  |
Net book value of the SEI Wealth Platform | 310,368 |  | 310,368 |  |  |
Estimated useful life of the SEI Wealth Platform | 15 years |  |  |  |  |
Amortization expense related to the SEI Wealth Platform |  |  | $ 28,345 | $ 25,046 |  |
Weighted Average [Member] | SEI Wealth Platform [Member] |  |  |  |  |  |
Estimated useful life of the SEI Wealth Platform | 7 years 9 months |  |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic net Income or Loss per outstanding limited partnership unit in the future and that were not included in the computation of diluted net income per limited partnership unit, because to do so would increase net income per unit amounts or decrease loss per unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1533-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1536-109256 + Details
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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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