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Quarterly Financial Data (SIV-Related Gains (Losses)) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 261,635 | $ 251,752 | $ 241,237 | $ 237,898 | $ 226,247 | $ 233,227 | $ 237,760 | $ 232,493 | $ 992,522 | $ 929,727 | $ 900,835
Income before income taxes | 87,544 | 83,501 | 78,501 | 79,950 | 68,603 | 74,900 | 82,820 | 92,164 | 329,496 | 318,487 | 369,781
Net income attributable to SEI | 56,585 | 50,743 | 49,555 | 49,965 | 44,396 | 49,232 | 53,603 | 57,728 | 206,848 | 204,959 | 231,687
Basic earnings per common share | $ 0.33 | $ 0.29 | $ 0.28 | $ 0.28 | $ 0.25 | $ 0.27 | $ 0.29 | $ 0.31 | $ 1.19 | $ 1.12 | $ 1.23
Diluted earnings per common share | $ 0.32 | $ 0.29 | $ 0.28 | $ 0.28 | $ 0.25 | $ 0.27 | $ 0.29 | $ 0.31 | $ 1.18 | $ 1.11 | $ 1.22
Effective tax rates | 35.00% | 39.00% | 36.60% | 37.20% | 34.70% | 33.80% | 34.70% | 37.10% | 36.90% | 35.20% | 37.00%
SIV Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per common share | $ 0.02 | $ 0.01 | $ 0.00 | $ 0.01 | $ 0.00 | $ 0.00 | $ 0.01 | $ 0.02 |  |  |
Total SIV-related gains (losses) | $ 5,897 | $ 3,389 | $ 1,072 | $ 2,882 | $ (738) | $ (792) | $ (1,944) | $ 6,864 |  |  |

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