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Accumulated Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments $ 1,879   $ 1,386
Accumulated Other Comprehensive Income (Loss) 14   1,487
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (1,966)    
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax 538    
Other Comprehensive Income (Loss) before Reclassification, Net of Tax (1,428)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 45 221  
Other Comprehensive Income (Loss) Reclassification Adjustment, Net of Tax 45    
Total comprehensive loss, Foreign Currency Translation Adjustments (1,966) (5,307)  
Total comprehensive loss, Unrealized Holding Gains (Losses) on Investments 493    
Total other comprehensive loss, net of tax (1,473) (5,407)  
SEI Investments Company [Member]
      
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments (1,865)   101
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments 1,879   1,386
Accumulated Other Comprehensive Income (Loss) $ 14   $ 1,487