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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments | $ 101 | $ 3,410 | $ (674) | $ 1,818
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments | 1,386 | 2,829 | 2,574 | 1,339
Accumulated Other Comprehensive Income (Loss) | 1,487 | 6,239 | 1,900 | 3,157
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (3,760) | 5,904 | (3,195) |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax | (1,149) | 341 | 1,369 |
Other Comprehensive Income (Loss) before Reclassification, Net of Tax | (4,909) | 6,245 | (1,826) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (294) | (86) | (134) |
Other Comprehensive Income (Loss) Reclassification Adjustment, Net of Tax | (294) | (86) | (134) |
Total comprehensive income (loss), Foreign Currency Translation Adjustments | (3,760) | 5,904 | (3,195) |
Total comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments | (1,443) | 255 | 1,235 |
Total other comprehensive (loss) gain, net of taxes | (5,203) | 6,159 | (1,960) |
Total comprehensive loss (income) attributable to noncontrolling interest, Foreign Currency Translation Adjustments | 451 | (1,820) | 703 |
Total comprehensive income attributable to noncontrolling interest, Unrealized Holding Gains (Losses) on Investments | 0 | 0 | 0 |
Total comprehensive loss (income) attributable to noncontrolling interest | 451 | (1,820) | 703 |
Total comprehensive (loss) income attributable to SEI Investments Company, Foreign Currency Translation Adjustments | (3,309) | 4,084 | (2,492) |
Total comprehensive (loss) attributable to SEI Investments Company, Unrealized Holding Gains (Losses) on Investments | (1,443) | 255 | 1,235 |
Total comprehensive (loss) income attributable to SEI Investments Company | (4,752) | 4,339 | (1,257) |
SEI Investments [Member] |  |  |  |
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments | 101 | 3,861 | (2,043) | 1,152
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments | 1,386 | 2,829 | 2,574 | 1,339
Accumulated Other Comprehensive Income (Loss) | 1,487 | 6,690 | 531 | 2,491
Noncontrolling Interest [Member] |  |  |  |
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments | 0 | (451) | 1,369 | 666
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments | 0 | 0 | 0 | 0
Accumulated Other Comprehensive Income (Loss) | $ 0 | $ (451) | $ 1,369 | $ 666

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