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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]        
Net income $ 49,739 $ 54,113 $ 99,974 $ 112,153
Other comprehensive income, net of tax:        
Foreign currency translation adjustments (2,156) 1,467 547 4,295
Unrealized holding loss on investments:        
Unrealized holding gains (losses) during the period, net of income taxes of $70, $348, $77 and $236 25 816 56 646
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 23 (28) (37) (131)
Unrealized Gain (Loss) on Investments 48 788 19 515
Total other comprehensive income, net of tax (2,108) 2,255 566 4,810
Comprehensive income 47,631 56,368 100,540 116,963
Comprehensive income attributable to the noncontrolling interest (30) (1,015) (783) (1,747)
Comprehensive income attributable to SEI Investments Company $ 47,601 $ 55,353 $ 99,757 $ 115,216