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Sale of SEI Asset Korea Sale of SEI Asset Korea (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 28, 2013 SEI Asset Korea Co., Ltd. [Member] | Mar. 31, 2013 SEI Asset Korea Co., Ltd. [Member] | Mar. 31, 2012 SEI Asset Korea Co., Ltd. [Member] | Dec. 31, 2012 SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Closing date, sale of subsidiary |  |  |  |  |  | Mar. 28, 2013 |  |
Contingent purchase price from sale of SEI AK |  |  |  |  |  | $ 11,220 |  |
Gain on sale of subsidiary | 22,112 | 0 |  |  |  |  |  |
Gain on sale of subsidiary, diluted earnings per share Impact, net | $ 0.08 |  |  |  |  |  |  |
Expected proceeds by Company from purchase price from sale of SEI AK |  |  |  |  |  | 56,879 |  |
Proceeds received at closing, net of transaction costs |  |  |  |  |  | 21,612 |  |
Sale of subsidiary transaction costs |  |  |  |  |  | 2,545 |  |
Proceeds from sale of SEI AK placed in escrow account |  |  |  |  |  | 32,722 |  |
Percentage of ownership before sale of subsidiary |  |  |  |  | 56.10% |  |  |
Assets | 1,342,610 |  | 1,309,824 |  |  |  |  | 54,783
Cash and cash equivalents | 452,099 | 388,127 | 452,247 | 420,986 |  |  |  | 48,306
Business segment that includes operating results of SEI AK |  |  |  |  | Private Banks |  |  |
Revenues of SEI AK |  |  |  |  | 2,889 |  | 3,126 |
Operating income of SEI AK |  |  |  |  | 796 |  | 616 |
Less: Net income attributable to the noncontrolling interest | (350) | (270) |  |  | (350) |  | (270) |
Net income attributable to SEI AK |  |  |  |  | $ 446 |  | $ 346 |

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