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Accumulated Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax | Accumulated other comprehensive income, net of tax, consists of:
| Foreign Currency Translation Adjustments |  | Unrealized Holding Gains (Losses) on Investments |  | Accumulated Other Comprehensive Income
Total accumulated comprehensive income at December 31, 2012 | $ | 3,861 |  |  | $ | 2,829 |  |  | $ | 6,690 |
Less: Total accumulated comprehensive income attributable to noncontrolling interest at December 31, 2012 | (451 | ) |  | — |  |  | (451 | )
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2012 | $ | 3,410 |  |  | $ | 2,829 |  |  | $ | 6,239 |
Total comprehensive loss for the three months ended March 31, 2013 | $ | (5,307 | ) |  | $ | (100 | ) |  | $ | (5,407 | )
Less: Total comprehensive loss attributable to noncontrolling interest for the three months ended March 31, 2013 | 451 |  |  | — |  |  | 451 |
Total comprehensive loss attributable to SEI Investments Company for the three months ended March 31, 2013 | $ | (4,856 | ) |  | $ | (100 | ) |  | $ | (4,956 | )
Total accumulated comprehensive income at March 31,2013 | $ | (1,446 | ) |  | $ | 2,729 |  |  | $ | 1,283 |
Less: Total accumulated comprehensive income attributable to noncontrolling interest at March 31, 2013 | — |  |  | — |  |  | — |
Total accumulated comprehensive income attributable to SEI Investments Company at March 31, 2013 | $ | (1,446 | ) |  | $ | 2,729 |  |  | $ | 1,283 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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