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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments $ (100)   $ (100)   $ 3,410
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments 1,656   1,656   2,829
Accumulated Other Comprehensive Income (Loss) 1,556   1,556   6,239
Total comprehensive loss, Foreign Currency Translation Adjustments 3,146 3,464 (3,961) 4,011  
Total comprehensive loss, Unrealized Holding Gains (Losses) on Investments     (1,173)    
Total other comprehensive income (loss), net of tax 3,555 4,060 (5,134) 4,626  
Total comprehensive loss attributable to noncontrolling interest, Foreign Currency Translation Adjustments     451 (833)  
Total comprehensive income attributable to noncontrolling interest, Unrealized Holding Gains (Losses) on Investments     0    
Total comprehensive loss attributable to noncontrolling interest     451    
Total comprehensive income attributable to SEI Investments Company, Foreign Currency Translation Adjustments     (3,510)    
Total comprehensive (loss) attributable to SEI Investments Company, Unrealized Holding Gains (Losses) on Investments     (1,173)    
Total comprehensive income attributable to SEI Investments Company     (4,683)    
SEI Investments Company [Member]
          
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments (100)   (100)   3,861
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments 1,656   1,656   2,829
Accumulated Other Comprehensive Income (Loss) 1,556   1,556   6,690
Noncontrolling Interest [Member]
          
Accumulated other comprehensive income (loss), Foreign Currency Translation Adjustments 0   0   (451)
Accumulated other comprehensive income (loss), Unrealized Holding Gains (Losses) on Investments 0   0   0
Accumulated Other Comprehensive Income (Loss) $ 0   $ 0   $ (451)