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Accumulated Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax | Components of Accumulated other comprehensive income (loss) consisted of:
|  | Foreign Currency Translation Adjustments |  | Unrealized Holding Gains (Losses) on Investments |  | Accumulated Other Comprehensive Income (Loss)
Total accumulated comprehensive income (loss) at January 1, 2010 |  | (1,053 | ) |  | 960 |  |  | (93 | )
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at January 1, 2010 |  | 1,351 |  |  | — |  |  | 1,351 |
Total accumulated comprehensive income attributable to SEI Investments Company at January 1, 2010 |  | $ | 298 |  |  | $ | 960 |  |  | $ | 1,258 |
Total comprehensive income |  | 2,205 |  |  | 379 |  |  | 2,584 |
Less: Total comprehensive income attributable to noncontrolling interest |  | (685 | ) |  | — |  |  | (685 | )
Total comprehensive income attributable to SEI Investments Company |  | $ | 1,520 |  |  | $ | 379 |  |  | $ | 1,899 |
Total accumulated comprehensive income at December 31, 2010 |  | 1,152 |  |  | 1,339 |  |  | 2,491 |
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2010 |  | 666 |  |  | — |  |  | 666 |
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2010 |  | $ | 1,818 |  |  | $ | 1,339 |  |  | $ | 3,157 |
Total comprehensive loss |  | (3,195 | ) |  | 1,235 |  |  | (1,960 | )
Less: Total comprehensive loss attributable to noncontrolling interest |  | 703 |  |  | — |  |  | 703 |
Total comprehensive loss attributable to SEI Investments Company |  | $ | (2,492 | ) |  | $ | 1,235 |  |  | $ | (1,257 | )
Total accumulated comprehensive income at December 31, 2011 |  | (2,043 | ) |  | 2,574 |  |  | 531 |
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011 |  | 1,369 |  |  | — |  |  | 1,369 |
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011 |  | $ | (674 | ) |  | $ | 2,574 |  |  | $ | 1,900 |
Total comprehensive income |  | 5,904 |  |  | 255 |  |  | 6,159 |
Less: Total comprehensive income attributable to noncontrolling interest |  | (1,820 | ) |  | — |  |  | (1,820 | )
Total comprehensive income attributable to SEI Investments Company |  | $ | 4,084 |  |  | $ | 255 |  |  | $ | 4,339 |
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 |

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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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