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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